Moggy is one of Boggy's three children, otherwise known as one of the crying bear cubs in Freezeezy Peak, in Banjo-Kazooie. When Banjo and Kazooie first enter Boggy's Igloo, they are greeted by a depressed group of three Polar Bear cubs. They tell Banjo that they are depressed because their father, Boggy, didn't get them any Christmas Presents. After searching Freezeezy Peak for the three presents, Banjo and Kazooie return the gifts to the children, leaving with a Jiggy, and leaving smiles on the Cubs' faces. For the remainder of the game, the Cubs are seen jumping up and down, shouting "Yipee", while their father just sleeps in his chair. In Banjo-Kazooie, Moggy wears blue pajama pants. He is the only one who has a speaking role in the 1st game.
In Banjo-Tooie, the three cubs go to Witchyworld with their mother. They run away in the Amusement Park, and refuse to leave the area. Their mother asks Banjo and Kazooie to round up her kids for her. Banjo and Kazooie have a hard time trying to get the kids to go back to their mother. In order to get Moggy back to his mother, you must hit him with a Grenade Egg. Neither Boggy nor his wife seem to care about that, as long as they got their child back, they're good. For the remainder of the 2nd game, Moggy is seen jumping on his parents' bed, in Hailfire Peaks. In Banjo-Tooie, Moggy wears blue jeans, a red cap, and a red t-shirt.