So, according to the deleted scenes, there was going to be a song called “Warrior Face”. Some time ago I’ve found this picture from “The Art of Moana”, where it depicts a scene that was not used in the movie.
You see Moana and Maui in Lalotai, and, from what I can get, he’s trying to teach her how to make scary faces so the monsters will run away in fear. So I’m pretty sure that the song is going to depict this very scene.
Also, little bonus, because wow:
If they actually kept the scene, I believe Tamatoa’s defeat should have been different: instead of getting hit by a geyser, he was actually going to fall on his shell… by getting scared of Moana’s scary face…