Fondacaro appeared in 1983's Star Wars Episode VI: Return of the Jedi, the third Star Wars film, as an Ewok, the only one to have a death scene. In 1986, he portrayed the invisible friend of a young Michael Gerber in the Disney Sunday Movie Fuzz Bucket, and also appeared in the fantasy film Troll. In 1987, he portrayed "Sir Nigel Pennyweight" in the cult horror film Ghoulies II. His performance is frequently praised, and he has been called the best actor in the film. In the same year, he appeared as "Greaser Greg" in The Garbage Pail Kids Movie, a theatrical adaptation of the popular trading cards. In 1988's Willow, he appeared alongside Warwick Davis, one of his Jedi co-stars, who, thanks in large part to his Willow role, became one of the most famous dwarf actors in the film industry.

Other prominent roles of Fondacaro's include "Hooded dwarf" in Phantasm II, Cousin Itt in Addams Family Reunion, and a dramatic turn as a dwarf with an average-sized son in "A Clown's Prayer", an episode of Touched by an Angel. He also played a dwarf with an average-sized daughter in the CSI episode, "A Little Murder". He also had a recurring role on Sabrina, the Teenage Witch as "Roland".

Fondacaro is married to Elena Bertagnolli, manager of another famous dwarf actor, Verne Troyer, and is represented by his wife's company, Fonolli Management. Fondacaro's brother Sal is also an actor, having appeared in Under the Rainbow, Return of the Jedi, and Invaders from Mars, all with his brother.

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