What is the name of the small green Jedi Master?

The small, green Jedi Grand Master who trains Luke on Dagobah is instantly recognizable by his diminutive stature, wise demeanor, and distinctive inverted speech. Don’t confuse him with Yaddle, a female member of the Jedi Council of the same mysterious species who appears briefly in The Phantom Menace; Grogu, the child from The Mandalorian who is not a master; or Kit Fisto, a tall, tentacled Nautolan Jedi. Beyond mentoring Luke and famously lifting an X-wing from the swamp, this character served as Grand Master of the Jedi Order during the late Republic. His species and homeworld remain officially unrevealed, enhancing his mystique. He was originally performed by Frank Oz using puppetry, which contributed greatly to his expressive presence and enduring cultural impact.