Mr. Thicknose, originally voiced by the late Robert Guillaume and later voiced by Dorian Harewood, is a character in The Land Before Time film series. He is a Pachyrhinosaurus, which is also called a "Thicknose" in the films and television series. He serves as a teacher to the children in the community of the Great Valley. Mr. Thicknose first appeared in the film The Land Before Time VIII: The Big Freeze and later served as a regular character in the television series.