In The Mandalorian season 2, Din Djarin is searching for a Jedi to train Baby Yoda - but that won't be easy, since there are very few Jedi left. In The Mandalorian season 2, episode 5, "The Jedi," Mando managed to track down Ahsoka Tano, a former Jedi and the one-time Padawan to Anakin Skywalker. However, Ahsoka declined to train Baby Yoda (whose real name was revealed to be Grogu) after seeing the close attachment that the infant had formed to Mando.
Having borne witness to Anakin Skywalker's fall to the dark side and his transformation into Darth Vader, Ahsoka was concerned that the fear felt by Baby Yoda and his love for his surrogate Mandalorian father could lead him down a similarly dark path. However, she suggested that Mando take Baby Yoda to the planet Tython, an ancient home to the very first Jedi Order. There, Mando must place the child on a "seeing stone" that will allow him to reach out to other Jedi through the Force.
The Mandalorian is set in 9 ABY (After the Battle of Yavin) - five years after the end of Star Wars: Return of the Jedi, and 28 years after the issuing of Order 66 and the Great Jedi Purge, during which most of the Jedi in the galaxy were wiped out. The recent series of Darth Vader comics details how the Jedi-turned-Sith Lord led a team of Jedi hunters called the Inquisitorius, tracking down and killing the few Jedi who had survived the purge. Despite the best efforts of Darth Vader and the Empire, however, a few Jedi escaped the eradication of their order. Here are all the known Jedi who are alive when the Mandalorian takes place, and who could respond to Baby Yoda's call.
Luke Skywalker
The protagonist of the original Star Wars trilogy is the Jedi that seems most likely to respond to a request for training from a youngling like Grogu (though Grogu is actually older than him). Luke was trained by Jedi Master Yoda, and would probably be very interested to meet another creature from Yoda's species. After the Rebel Alliance's victory at the Battle of Endor in Return of the Jedi, Luke travelled the galaxy searching for artifacts and knowledge about the Jedi Order that had been lost after the Great Jedi Purge. He would later go on to found his own Jedi training temple in the hopes of raising a new generation of Jedi, including his nephew Ben Solo, though this wasn't until a few years after The Mandalorian's current storyline.
Din Djarin and Baby Yoda's path does seem set to collide with Luke Skywalker's, but the character is unlikely to appear in The Mandalorian for a few reasons. First, one of the show's strengths is that it has mostly eschewed appearances from the Original Trilogy's legacy characters, focusing instead on its own original characters with appearances by characters like Bo-Katan and Ahsoka Tano from the animated Star Wars properties. Moreover, an appearance by Luke Skywalker would require either recasting the role or pulling off some seriously impressive de-aging on Mark Hamill to make him look like a twenty-something again.
Leia Organa
Though not a Jedi in the Original Trilogy, Leia Organa was Force-sensitive and received Jedi training from her brother after the end of Return of the Jedi. Leia and Han Solo's son, Ben, is about four years old at the time The Mandalorian takes place. Leia herself is currently occupied with her senatorial duties within the New Republic, the galactic government that was established after the fall of the Empire. As seen in "The Passenger" with the appearance of two New Republic pilots, some efforts are being made to establish control in the Outer Rim worlds where The Mandalorian is set, but the New Republic's power is mainly limited to the Core Worlds. Given her duties as a senator and a mother, not to mention the potential controversy of recasting Leia just a few years after Carrie Fisher's death, an appearance by Leia Organa in The Mandalorian seems unlikely.
Ezra Bridger
"The Jedi" was a particularly huge episode for fans of Star Wars Rebels, as it hinted at the return of Ezra Bridger, one of the show's protagonists. In Rebels' series finale, Ezra ensured the defeat of Grand Admiral Thrawn by calling upon a species of space whales called Purrgil to take hold of Thrawn's Star Destroyer and drag it into hyperspace - with both Thrawn and Ezra inside it. Ezra's fate is still unknown, but at the very end of Star Wars Rebels Ahsoka Tano teamed up with Ezra's close friend, the Mandalorian Sabine Wren, to embark on a new mission to find Ezra. The Mandalorian is set five years after this finale, and in Ahsoka's final confrontation with Morgan Elsbeth she demands to know the location of the Magistrate's master, Grand Admiral Thrawn. This indicates that Thrawn returned from wherever the Purrgil took him - and that Ezra may have as well.
The Mandalorian is extremely good at keeping plot and character reveals under wraps. Baby Yoda was kept a closely-guarded secret so that his reveal at the end of the first episode would have a greater impact, and we can expect more surprises on the way. Though The Mandalorian was rumored to be casting a live-action Thrawn earlier this year, we still don't know who will play the blue-skinned Imperial leader or when he might appear. Given the show's creative ties to Star Wars Rebels (creator Dave Filoni is a writer, director and executive producer on The Mandalorian) and the introduction of Bo-Katan and Ahsoka Tano in The Mandalorian season 2, it seems likely that Ezra could be the Jedi who ends up responding to Baby Yoda's call.
Ahsoka Tano
Ahsoka Tano has already met Mando and Baby Yoda and declined to train the youngling herself, but she's worth mentioning as one of the few Jedi known to be active during the time of The Mandalorian. Ahsoka actually left the Jedi Order at the end of Star Wars: The Clone Wars, in order to seek her own path. Nonetheless, she still wields her lightsabers and maintains a connection to the Force. When Ahsoka returned in Star Wars Rebels she told Darth Vader "I am no Jedi," and this is reflected in the color of her lightsabers: they are white because she belongs to neither the Sith nor the Jedi. Still, she makes no denial of being a Jedi in her discussions with Mando, and since the old Order was destroyed it arguably doesn't matter whether she belongs to it or not.
Cal Kestis
One interesting possibility for Jedi who could help Baby Yoda is Cal Kestis, the protagonist of the 2019 canon video game Star Wars Jedi: Fallen Order, and one of the few Jedi known to have survived the purge. Though he was initially driven into hiding, Cal was forced to fight back when he was hunted by the Inquisitorius and joined efforts to restore the Jedi Order. Cal would be an interesting character to introduce in The Mandalorian; because he's so far only appeared in Fallen Order, most viewers will be unfamiliar with him, and he would therefore fit in with The Mandalorian's theme of exploring lesser-known corners of the Star Wars galaxy. And for fans of Fallen Order, an appearance by Cal would allow them to find out what happened to him after the events of the video game.
This is one role that wouldn't necessarily need to be recast, as Shameless actor Cameron Monaghan played Cal in the game and his likeness was used for the character. The Mandalorian is set 23 years after the events of Fallen Order, however, so Monaghan would have to be aged up for the show. It's unknown for certain whether or not Cal is even still alive in 9 ABY, but unless he's confirmed to have died prior to the events of the show, he remains out there as a potential Jedi contact.
Cere Junda
Another character from Star Wars Jedi: Fallen Order, Cere Junda managed to escape the initial massacre of Order 66, but was later captured and tortured. She eventually escaped by tapping into the dark side of the Force and using it to kill her captors, but in the wake of this she suppressed her connection to the Force for fear of falling completely to the dark side. She worked alongside Cal Kestis to attempt to restore the Jedi Order, and her experience would make her a valuable teacher for Baby Yoda if she is still alive at the time of The Mandalorian. That said, she may not be willing to take on another apprentice after her Padawan, Trilla Suduri, fell to the dark side and joined the Inquisitorius. Junda was voiced by and modeled after actress Debra Wilson, who is primarily a voice actor but could easily be cast in the role of a live-action Junda. As with Cal, we don't know for sure whether or not Junda is still around in 9 ABY, but for now we'll file her under "potentially alive."