Terroga

Terrogas were creatures displayed on circuses such as the Freklas Snarl Circus. They required training, provided by individuals like Prod.

Behind the scenes
Terroga was mentioned in Monsters and Aliens from George Lucas, a book published in 1993. Lucasfilm employee Leland Chee, who maintains the Holocron continuity database, has indicated that information contained in the book is non-canonical.