Mechakkero

Mechakkero (メカッケロ) is a hopping enemy in Mega Man 3. Sometimes they appear near platforms over large gaps. One shot from the arm cannon is enough to defeat them, but they are hard to hit due to their small size, especially while on the ground. Weapons like Search Snake and Shadow Blade can defeat them easier. They appear in Top Man's, Shadow Man's and Gemini Man's stages in Mega Man 3, II and III, and in the third Wily Tower stage in Mega Man: The Wily Wars.

Kerone
Kerone (ケローン) is a modified version of Mechakkero in Mega Man 7. They are larger and different from the original, but their modus operandi is the same. They appear in Burst Man's and Slash Man's stages. They are also released by the giant frog used by Shadow Man and one of Stone Man's attacks in Mega Man 2: The Power Fighters.

Trivia

 * The names Mechakkero and Kerone are derived from "kero", the onomatopoeia of the sound made by frogs, ribbit.

Similar enemies

 * Palm Hopper
 * Batabattan