Toady Bloysters are slug-like creatures in the family called Molluskings. They creep along the ground in search of food, and when they see your Pikmin, they make a loud noise and unleash 5 or 6 tentacles fom its mouth that latch onto your Pikmin and it eats them. However this creature goes so slow, such a fact is very trivial. In order to defeat this creature, you need to either attack the tail resembling object on its end, pound its large body with your Purple Pikmin, or attack it while it is petrified.
This creature is very rare, it is only found in the large pool in the Perplexing Pool that leads to the Shower Room, or in the Giant's Bath in Challenge Mode. The one at the Perplexing Pool drops 1 or 2 ten pellets of random color, and the tail is worth 25 Pikmin! In total, you could get 45 Pikmin by defeating this creature. If you entered and reentered a cave you could get many Pikmin quickly.