What is a Carrock in The Hobbit?

Answer 1

The Carrock is a great rock, almost a hill of stone, cropping out of the ground right in the middle of a stream, with the stream looping itself around it. The Rock has a flat space on top of it, and a well worn path with many steps leading down to the river.

The Rock is located not far from the house of Beorn, a strange mountain man who can change into a bear. Gandalf the Grey tells the company that Beorn was the one who carved the steps in the rock, and that Beorn was the one who named it the Carrock. When asked by Bilbo why it is called the Carrock, Gandalf replies,"He called it the Carrock because carrock is his word for it. He calls things like that carrocks, and this one is the Carrock because it is the only one near his home and he knows it well."

Answer 2

The carrock is a sort of rock outcropping near the river. It is called that by Beorn. It is where the eagles dropped off the adventurers after their night in the eagle aerie.