Cheato

Cheato is Gruntilda's spellbook. He is found in both Banjo-Kazooie and Banjo-Tooie. Cheato in Banjo-Kazooie gives you three cheat codes: FEATHERS, EGGS, and GOLDFEATHERS. He will give these to Banjo if you find him. They can only be activated when banjo has found Cheato three times.