He is a Saraulphus like Ducky. His parents were killed years ago by Sharpteeth and he has spent some of his teen years hiding from Sharpteeth, so he doesn't know how to have fun that well. Also, he doesn't think he can sing well, but finds eventually that he can.
He is introduced in The Land Before Time XXII: Journey of the Great Flyer where he meets and falls in love with Ducky. He and Ducky get married at the end of The Land Before Time XXV: The Four KInds Quest Part 3: The Heart Whispers.
The two of them have at least 25 kids.