User blog comment:Granditamias/More tiny JW:E Dinosaurs/@comment-2118191-20190919202421/@comment-33613830-20190919204105

Well, we have the rumored Pachyrhinosaurus, Charonosaurus, and the Mussaurus.

My bet is on the former two, since Pachyrhinosaurus is quite popular, and the Charonosaurus.