Yes, that does appear to be the body of wise and kind Jedi Master Tera Sinube, who was introduced in the The Clone Wars season 2 episode “Grievous Intrigue” but is best known for the Ahsoka Tano-centric “Lightsaber Lost.” An older Jedi who needed a cane to walk, Sinube spent most of his time in the Jedi Temple, studying the Archives or instructing younglings. But despite his aged appearance, Sinube was also very skilled with the weapon of a Jedi Knight, and even had his walking stick refitted as a sabercane (exactly what that sounds like).
In “Lightsaber Lost,” Ahsoka’s saber is stolen while trying to catch an arms dealer in the slums of Coruscant. Sinube, who knows his way around the criminal underground of the city planet, offers to help Ahsoka recover her weapon, leading them through a conspiracy that also involves a dead assassin and your fair share of scum. In the end, Sinube helps Ahsoka get her lightsaber back by showing her the value of having patience.
Sinube appeared in several other episodes of The Clone Wars as a background character, including in the season five finale “The Wrong Jedi,” which saw Ahsoka leave the Jedi Order after being falsely accused of bombing the temple on Coruscant. While we never actually see how Sinube died in the Jedi Purge, he does briefly appear in Yoda’s vision of Order 66 in the season 6 episode “Destiny,” which foreshadows the deaths of several characters during the events of Revenge of the Sith. As we know now, Sinube’s fate was sealed even back then.
While Star Wars‘ foremost member of the Cosian race, Sinube was actually adapted from unused concept art for The Phantom Menace, according to StarWars.com. Artist Terryl Whitlatch originally designed this species as one of the many new ones featured in the Galactic Senate sequences, but Cosians didn’t make it into the final product. Fortunately, we finally got Tera Sinube in The Clone Wars. It’s too bad he also had to make his way into Obi-Wan Kenobi…
Source : https://www.denofgeek.com/tv/star-wars-who-is-tera-sinube/