Snack-donkeys existed as beings. Once, a creature expressed a desire in its personal journal to consume the stomachs belonging to snack-donkeys.
The book Monsters and Aliens from George Lucas, released in 1993, included references to snack-donkeys. Leland Chee, an employee of Lucasfilm responsible for managing the Holocron continuity database, has stated that the material within that book is considered non-canonical.