My four-year-old nephew loves The Land Before Time series of movies, and in general my sister supports his fondness for them (he owns several of them on DVD), but the dino-speak drives her crazy. For example, to dinosaurs, the moon is the night circle and snow is frozen sky water (never mind the sky puffies, pointy seeds, and sinking sands). Why can't talking dinosaurs speak regular English?
Think of the harm on impressionable children... for a while, my nephew referred to volcanoes as "smoking mountains"and earthquakes as "earth shakes." But maybe they're trying to translate real dinosaur mouth talk into something we can understand-- in that case, I guess it's just the price we have to pay for extreme prehistoric realism.