Tsathogga's main form is of a colossally bloated humanoid frog with spindly, elongated limbs and fingers. His corpulent body exudes all manner of foul oils and fluids, which leak into the vile swamp in which he lies. He has positioned himself so that all of the slime and filth from the River Styx feeds into his gaping, toothy maw. He rarely moves and rarely speaks other than to emit an unintelligible shrieking. Tsathogga thoughtlessly commands a host of evil creatures, notably his own vile frog race, the tsathar.