I’m so sorry for the delay, I got suspended for a bit. (And sorry ludia for making you suspend me.)
But, The spinoconstrictor Rex Is a hybrid of Sponoconstrictor, (As you may have thought) And T.Rex. It has its own special Animation (because its body is so weird.) In both Jw:TG and JW:Alive.
It literally looks like A mini apatosaurus With Long claws, Sharp teeth, A short neck, A crocodile head, and feet that are slightly Long.
Here’s some art:
Credits to @Snake_Dude For the art.