Kerog (ケロッグ Keroggu?), also known as Croaker in the Mega Man 2 instruction manual for the U.S., is a robotic frog found in Bubble Man's stage in Mega Man 2. They spit out three "Petit Kerogs". Even if there are multiple large Kerogs, as long as at least one "Petit Kerog" is on screen, they will not release any more. The "Petit Kerogs" are explosive in Super Adventure Rockman. In Mega Man: The Wily Wars, Kerogs are also found in Mega Water S's Stage, as well as the second Wily Tower Stage.