Banjo-Tooie (Xbox Live Arcade)
Madame Grunty is a character found in Witchyworld in Banjo-Tooie. If you go inside her tent attraction in Witchyworld, she might give you eggs, feathers, or just a plain old beating. If you visit her enough times, she will give you a cheat code that will let you read the signposts in Jiggywiggy's Temple that tell you how to get all the Jiggies.
It is probable to assume that, due to the fact that Madame Grunty shares the same name, voice, and avatar as Gruntilda, that they are the same person. This would be odd though, due to the fact that she gives you feathers and eggs on occasion and that it is possible to visit her after you defeat Grunty and beat the game.
Note:When you "win" a beating from Madame Grunty, the sounds heard are from Banjo-Kazooie. Banjo's yelps from pain are the same yelps that are heard in the first game, and Grunty's laugh is the same as the one she has in the final battle from Banjo-Kazooie. Also, if the beating takes out your last honeycomb, you will see a unique death animation similar to when Banjo is regularly thrown out, only he doesn't get up again.