Icebon

Icebon (アイスボン) is an enemy from Mega Man Zero 3. It appears in the Ocean Highway Ruins (Childre Inarabitta's stage). It usually fires chunks of ice but other times it will send out a spiked block of ice.

Etymology
The latter name is probably derived from "bon (ボンッ)", Japanese onomatopoeia of appearance, discharge, and others.