A floor dwelling Monty Mole that peeks its head out, proceeds to pull out a Rock or an aggravated Bob-Omb that explodes on contact and throws it Mario's way in an arch.
While the Bob-Omb might seem like the better projectile, it also might just blow the Mole itself up, thus helping the player out a little.
Maybe use them with blocks that can be blown up for alternate pathways or secret routes?
The included graphics overwrite part of the Sumo Bros. graphics because that's a lot of space and allows the use of the other Moles. The explosions use a Sumo Bros. tile, so it had to be overwritten anyway.