Frogs are minor enemies that mostly appear in the Haunted Towers and Treacherous Mansion of Luigi's Mansion 2. They are usually harmless, simply hopping around aimlessly, though if Luigi touches one he will lose 5 HP. Luigi can use the Strobulb to turn them into coins, much like a Spider, Beetle, etc, or simply suck them up with the Poltergust 5000 (but with no reward). There are also gold versions that drop one Gold Bar when flashed with the Strobulb. Frogs also appear in the only mission of King Boo's Illusion.
- Unlike most other gold versions of minor enemies, gold frogs don't try to run away from Luigi when seen.