Mumbo Totem

Mumbo Tokens are small silver skulls found Banjo-Kazooie. Gruntilda stole them away from Mumbo Jumbo and scattered them throughout various worlds. Banjo and Kazooie must collect them and return them to Mumbo, and in exchange he will offer his services by transforming them into an animal that matches the particular world's theme. A sign inside Mumbo's Skull will dictate how many tokens each transformation spell costs, and once a spell has been paid for, the pair can use it as many times as they need.

In Banjo-Kazooie: Grunty's Revenge, Banjo would receive small, skull-shaped pieces of magic from defeating Gruntilda and Klungo at various mini-boss fights throughout the game. Mumbo would accept these as a new totem for him in exchange for transforming Banjo into a new animal. Because the game takes place in the past, this is believed to be the origin of Mumbo Tokens.