This is Tremor from the Spawn comics, adjusted to the MU scale. I used the Thing from the Secret Wars Bulldozer/Thing 2 pack, and modified a McFarlane toys Tremor head with lots of trimming, reshaping and some sculpting. Full repaint to finish him off, and here he is. I always liked Tremor, and was so disappointed when he all but disappeared.
The figures contained in the Custom Showcase are not for sale by Figure Realm, and the creators of the customs are no way affiliated with Figure Realm. The Custom Showcase is purely for entertainment purposes and only provides a means for the creators to show off their work and trade ideas. Figure Realm does not make or sell customs.