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.