Prosaurolophus

Prosaurolophus (before Saurolophus, in comparison to the later dinosaur with a similar head crest) is a genus of hadrosaurid (or duck-billed) dinosaur from the Late Cretaceous of North America. It is known from the remains of at least 25 individuals belonging to two species, including skulls and skeletons, but it remains obscure.

Jurassic Park
Prosaurolophus 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.