What dinosaurs currently have canon/semi-canon nicknames?
The ones I'm aware of are
JP T.rex: Rexy and Roberta
JP Raptors: The Big One, Randy and Kim
Indominus Rex: Darcy
Camp Cretaceous Baby Ankylosaurus: Bumpy
Camp Cretaceous Carnotaurus: Toro
Camp Cretaceous Baryonyx: Grim, Chaos and Limbo
Names from JP:TG I'm not including as what parts of it are and aren't canon (if any) have not been specified.