I think this depends entirely on what exactly you’re basing your question on LOL, but I agree that it’s a very good part of monsters. However, I would like for you consider tails as the best part of a monster: variety and uniqueness as much as or even more than their tongues may have when it comes to certain aspects (tails may or may not incorporate characteristics of their entire body like fur/scales/textures/etc, different lengths, and so forth). There is more I could say but I shall leave that to your imagination haha.