A fish enemy that appears both underwater and at the surface of water stages. In underwater levels they swim in fixed horizontal lines. In above-water stages, red Cheep-Cheeps leap out of the water in arcs while grey ones fly straight across the screen at high speed.
Stomp the leaping ones out of the water, or hit them with fireballs on land stages. Underwater, swim above or below their paths to avoid them — they cannot be stomped while submerged.