The Yeti Krab is a monster who appears in the episode of the same name.
The Yeti Krab is tall, light red, and has white hair on his legs, eye stalks, forearms, and upper body. He has large light yellow teeth, light green eyes, and a bad temper. He also has an oddly shaped nose.
He comes to Bikini Bottom after Mr. Krabs tells his tale about a Yeti Krab who eats lazy employees, like Squidward. The Yeti Krab is usually angry, especially when provoked by Squidward and SpongeBob. Mr. Krabs only made his story to try and make Squidward work.
He comes to Bikini Bottom for a look around, and smells the Krusty Krab's food, after becoming hungry. He goes to the Krusty Krab for food, and SpongeBob realizes the monster is real. Squidward thinks it is Mr. Krabs dressed up. SpongeBob works in overdrive to avoid getting eaten, and Squidward is finally fed up with the Yeti Krab. He arrogantly attacks the Yeti Krab, as Mr. Krabs walks inside the Krusty Krab.
The Yeti Krab ties the three up, and begins to cook them. Only when SpongeBob activates his emergency Krabby Patties, does the Yeti Krab eat those instead of the three captives, and he leaves the Krusty Krab.
There is a real-life creature called the yeti crab.