Mousse is a woodsman Goku met when Mr. Popo sent him to a forest in search of someone who can train his mind.

Mousse and his wife Eclair have nine children, all named after sweets, who are (from oldest to youngest): Crepe, Cookie, Cocoa, Creampuff, Jam, Jelly, Donuts, Pudding, and Cupcake.

While Goku was searching for something to eat, he fell into a trap that Mousse had set in order to trap rabbits and wild boars. Freed from the net, Goku was taken to Mousse's home and introduced to his family. When their grandfather, Korinto, returns with his day's catch, a feast is prepared and the family tells Goku about Yaochun, the strongest man around.

(Source: Dragon Ball Wiki)