Which story is er Pants (on Shrek Happily ever after) supposed to be from?

Do you know that chubby kid ,er Pants, from Shrek happily ever after who (in the beginning) kept saying "Hear th roar!" and also said "I love you daddy" Well what fairytale is er pants from? Because Pussinboots has a story, Pinocchio has a story but wheres er Pants from? Please dont say "I dont know" if you dont know then dont answer. Thx