Deadlands by Skye Melki-Wegner

Eleri is an oryctodromeus, a small dinosaur raised in an underground warren. He dreams of becoming his herd’s storyteller but when he saves an enemy soldier from a pterosaur attack, he is exiled to the Deadlands.
 
To survive this scorched desert full of carnivores, he joins a herd of other young exiles, including a peppy stegosaur, a stoic sauropod, an irritable triceratops…and a mysterious spy. Can five young misfits save their warring kingdoms?