Tanktup

Tanktup is a large, brown turtle found in Bubblegloop Swamp in Banjo-Kazooie. He complains about having cold, numb feet which Banjo and Kazooie can remedy by Beak Busting his flippers, shocking him into pulling them inside his shell. He thanks them afterwards and opens his mouth to cough up a Jiggy, also allowing access inside his shell which you can travel into to find Tiptup and his choir. A wooden model of Tanktup can be seen in Banjo-Kazooie: Nuts and Bolts in Banjo Land, but mentions that Tanktop disappeared afterwards and the current location is unknown.