Dracorex

Dracorex is a pachycephalosaur from north America and isn't a baby pachy, it is also named the dragon king of Hogwarts. there are also 2 variants seen one mainly green the other mainly yellow.

Zilla's the lost world remake:

multiple Dracorex are seen on the game trail along with protoceratops, Triceratops, Amargasaurus and Pachycephalosaurus. at the end a group of 14 Dracorex were grazing while a Sinoceratops herd was walking past and a Majungasaurus was playing with it's offspring.