The fact that Troˆdons were only found at what today is the Southpole doesn't necessarily rule out the possibility that the Rainbowfaces may be Troˆdons. Dinosaur kinds which were found in Asia, America or Africa ONLY were shown in the LBT movies, which makes a science based localisation of the Great Valley very difficult. I don't consider it very likely though that the Rainbowfaces are carnivores. If they were, I doubt they would be accepted as much as they are in LBT 7. They could be Dryosauruses, a herbivore kind which resembled their outward appearance. I don't know about Dryosaurus being considered extremely intelligent though. They might work out as Parksosauruses as well or as Zephyrosauruses.