Abominable snow mollusk
The Abominable Snow Mollusk is a huge monster that appeared in the special episode Frozen Face Off. Unlike other monsters shown, it is animated with stop-motion.
Mr. Krabs has mentioned that he once encountered the Abominable Snow Mollusk in his past and that he and his crew were eaten by the creature. They had to "wait for nature to take its course" in order to escape its stomach.
When Spongebob and the gang escaped the Abominable Snow Mollusk, it got the taste of Patrick's last gummy worm. It was then the monster earned a craving for sweets. When they encountered the monster again, it ate the jelly beans in Patrick's pocket. It then ate Plankton thinking he was a jelly bean.
The Abominable Snow Mollusk has a greyish-white body with tentacles for arms and legs. It also has fur around its neck, fin-like ears, sharp teeth, and yellow eyes. Since Frozen Face Off, it grew a craving for candy.