Don't Forget Dexter by Lindsay Ward (2017)
When his best friend, Jack, leaves him behind at the doctor’s office, Dexter T. Rexter panics. First he tries to find Jack. Then he sings their special song. Then he sings their special song even louder. But when Jack still doesn’t appear, Dexter starts to wonder. What if he’s being replaced by another toy? It can’t be—after all, he can STOMP, RAWR, and CHOMP! Right? Right?