Fast Friends - Buddy, Tiny, and Mom ride the Dinosaur Train to meet Oren and Ollie Ornithomimus, some of the fastest dinosaurs ever! Our kids love meeting the fast-moving and fast-talking twins. T. rex Teeth - When Buddy loses a tooth, Mom takes him to Rexville to ask his Tyrannosaurus friends all about T. rex teeth. They explain that he'll grow new teeth to replace the old ones.