We don't expect Bonk's Adventure to be historically or biologically accurate. The very coexistence of cavemen and dinosaurs (and malevolent, animate flowers) comes to mind as a significant departure from reality, as do the talking dinosaurs who promise to be "YOUR NEW FRIEND ARF ARF ARF!!" Early man didn't live on floating, airborne fruit, nor did meat enable him to transform into an invincible, volcano-headed monster. Probably. But all those odd, fanciful uses of creative licenses are done in the name of gameplay or to create a cute setting or narrative.
But we don't know why developer Red decided that the dinosaur who comprises level 1-4 needed several uvulas. How do you even get that idea? Using the dinosaur's uvula as an obstacle is clever, but multiplying it is vaguely psychotic. Also, they have little smiley faces -- why not? Maybe someone at Red knows a lot more about dinosaur anatomy than anyone else -- or a lot less.