Squiggoth

The Squiggoth is a particular breed of Squig that grows to massive proportions. Orks with a particularly low-tek bent, such as Feral Orks and the Snakebite clan, make use of them as transports and/or heavy artillery embankments, steering the monstrous multi-ton quasi-dinosaur beasts into the enemy. Covered in ramshackle armor, bristling with turrets manned by desperate grots and more than willing to trample, gore, crush or eat anything in sight, squiggoths are surprisingly effective.

Though they haven't been seen in ork army lists since Chapter Approved did its entry on Feral Orks, they have retained notability by being the ork Relic Unit in Dawn of War.

In Dawn of War

The Big Squig isn't the most destructive thing around (those honors go to the Baneblade and Bloodthirster) neither is it the fastest (Also, since it's so fat, it's prone to getting stuck in your base if you built Da Mek Shop in the back). It could almost be called a Land Raider with a mouth fulla teef an' stompin' feet, since it has two slots of transport capacity for Boyz getting stuck in. As you can imagine, this makes for incredible versatility, not in smashing things, but in dumping a threat straight on the opponent's head, and having another threat pop right out. Rampage helps a lot with this, as well as making those puny otha gits fly errywhere and clearin' a path fer da WAAAGH!