“He spoke the liquid, chattering tongue of the Sullustans.” [link]
According to his IMDb, Rotich, a student from Kenya, provided the voice of Nien Nunb in Star Wars: Episode VI Return of the Jedi.
Rotich voiced Nunb by speaking in Haya, an African dialect from Kenya, which created a sensation in the country because audiences here could understand what the character was saying. Rotich thus became a minor film star in Kenya for a time.
The very first thing he says in the movie before the attack is in the native tongue of Kenya’s tribe, the Kikuyu, and it translates to, “All of you over there, come here.” [link]