The Lou Carcolh is a monster from French folklore that resembles a mix between a gigantic snail and a serpent with multiple tentacles, fearsome and predatory by nature these creatures would often hide in caves or other dark places and try to capture humans and other animals to devour whole.
Despite their bizarre appearance they were regarded as a type of dragon, though it rarely has any breath attacks, in some tales it does have some poisonous traits however, much like some serpents.