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Gromps are the stage in Twonkie evolution that is one step up from Stompers.  Some of these gruesome creatures hurl orbs of destruction at anything they like.  On Earth, twenty-five Gromps infested the “Bat Outta Heck” amusement park ride, until Jimmy Neutron used the Sheenograph and VDR to make one of the cars into a Gromp-exterminator.

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