HELMASAUR
[Behavior] Helmasaurs amble around the room until they spot Link. They'll then charge him, their pointed mask acting as a piercing weapon.

[Tactics] You need to remove the mask firstly, so either pull it off with the Hookshot or the Gust Jar, and then the Helmasaur is defenseless.

[Tidbits] "Helmasaur" is one of the many monster names made of two different words, namely "Helm" — meaning Helmet — and "Saur" — meaning Lizard.