Sludge

Sludge is a Titan that is more poisonous and revolting than the Stench.

It is a mutated toxic sludge that specializes its slime for attacks, it can extend or expand its arms to attack its foe, it slimy body also gives it the ability to shapeshift, it can sink into the ground and form a slug like form and then come up from behind and punch the enemy with an uppercut. It also vomits a highly venomous acid that poisons Crash and other foes, when a Titan gets poisoned by Sludge's toxic venom, the Titan will be engulfed by a toxic green gas signifying it was poisoned, when Crash attacks the poisoned Titan, the Titan will be instantly stunnned. In Mind Over Mutant there are some non-mutated Sludges living In the Junkyard.

Trivia

 * It is not yet sure how exact it was mutated though obviously it was mutated from a radioactive sludge.
 * The sludge is that and a chameleon, but in mind over mutant it's a sludgy pig/boar.

He is the only titan/mutant that can stay in toxic sustances without diying
 * When jacking Sludge, Crash doesn't ride on its back. Instead,Crash will sink inside the Sludge's belly.
 * Strangely in Crash of the Titans,Sludge's species is chameleon,but in Mind Over Mutant Sludge's species is Boar
 * As you know, Titans can also be called Mutants as well, the Sludge is the only true mutant since it is just a couple dropping eminating with Mojo.