Octogon

In Oracle of Ages, it acts as the Boss of the Mermaid's Cave. It is unexplained why this creature lacks the ability to spit rocks like it's relative, but the Octogon may explain the origin of the Big Octo, who ultimately took the Octogon's place in later games, such as Ocarina of Time, where it plays as a Mini-boss of the Dungeon:"Inside Jabu-Jabu's Belly."

See: Hardhat Beetle