Gragg refers to a particular being. On a certain Tuesday, a thinking entity intended to emerge from its grotto with the purpose of locating and then devouring Gragg, documenting these intentions within its everyday journal.
Gragg appeared within Monsters and Aliens from George Lucas by Bob Carrau, a work released in 1993. Leland Chee, an employee of Lucasfilm who is responsible for the upkeep of the Holocron continuity database, has expressed that the details presented in the book are considered non-canon.