Octoroks are mollusks related to octopi. They have eight short suckered tentacles, two small but well-developed eyes, and a large sucking mouth lined with teeth. They are about 2 feet high, and 4 feet from the tip of a tentacle to the other.
What makes these creatures dangerous (aside of their ability to bite), is that they can swallow stones and use their powerful stomach muscles to throw them back out of their mouths, at full Attack within 5 feet, and half of Attack from 5 feet to 10 feet (max), dealing a Buffet to any creature they hit.