What is a mooth?

According to the Info Dad website…

On one page, dinosaurs – Tyrannosaurs, no less – are seen “munching on a mooth.” Schnetzler (the author) invented that Word to get a rhyme for “tooth,” intending “mooth” to mean “moose.” But Harris (the illustrator) did not want to show dinosaurs eating a moose in a book intended to appeal to very young children, so he drew what looks like a gigantic strawberry. This makes absolutely no sense, especially since Tyrannosaurus Rex was a carnivore, but parents – now forewarned – can make a joke out of the whole thing, and appear wise as well as skilled in rhymed reading as they go through this clever and inventive little book.