Herbivore suggestion: Parasaurolophus & Saurolophus
As the title says, I think these two would be a nice addition. I feel like, in contrast to the carnivores, there is a little amount of herbivore variety (and 3 of 11 are Ceratopsia species). I think they could be a good addition. With skins, skill & subspecies models, different head crests, they can both be unique from each other (as well as different from Lambeo) & although this family being semi-aquatic is up for debate, having 1 of them having access to swimming abilities like "Paddle" would further make them unique with a different playstyle.
Also, due to some nostalgia linked to the animated movies "The Land Before Time" (a character called Ducky was based on these species) I think these could be popular.
Thanks for reading.