Prenocephale

Prenocephale was a small pachycephalosaurid dinosaur genus from the Late Cretaceous (Campanian) of Mongolia and was similar in many ways to its close relative, Homalocephale, which may simply represent Prenocephale juveniles.

Jurassic Park
Prenocephale has never appeared or mentioned in any Jurassic Park films or books, it has however appeared in the Dinosaur Field Guide as well as the Jurassic World Dinosaur Field Guide.