Clothahump is a fictional character in the Spellsinger

Spellsinger

Spellsinger is a series of fantasy novels written by Alan Dean Foster. At present the series consists of eight books, and although there was a significant gap between the writing of book six and book seven, it seems unlikely that any more will be written....

 series by Alan Dean Foster

Alan Dean Foster

Alan Dean Foster is an American author of fantasy and science fiction. He currently resides in Prescott, Arizona, with his wife, and is also known for his novelizations of film scripts...

. Clothahump is a wizard who pulled Jon-Tom into the world where the books take place. He is apparently the most powerful wizard on the planet. He is a turtle

Turtle

Turtles are reptiles of the order Testudines , characterised by a special bony or cartilaginous shell developed from their ribs that acts as a shield...

who walks upright with various secret drawers in his shell; what is in them only Clothahump knows.