Yes, whales do poop as a way to release toxins from the body as do dolphins and porpoises; and pretty much all known animal species for that matter. read more
Blue Whale poop is a sludgy red liquid, less dense than water. It is bright red due to a high iron content - the iron is found in the krill the blue whale eats. The whale poops near the surface of the water when breathing, then swims back down into deeper water to eat or travel. read more