It seems all the flat teeth have their own language and the sharpteeth theirs, and Mo's kind have their language, instead of each dino species having their own language. It may only sound like grunts, hisses and not like they could have many words in a language consisting of that, but likely the folks who did the grunts and such were not doing a true language and it may not sound like one to another not use to that. Look at some folks who do speak a whistle language on earth, or the one with clicks in it, those may sound like you can't have a language of just whistles but there is one, and one may doubt a language that has clicks in it could have some words that are clicks but if you told that the folks who know one of those languages they may look at you like you are not very smart.