The Saw-Horse is a character from L Frank Baum's Oz books series. He first appears in the The Marvelous Land of Oz.
The Saw-Horse is literally a sawhorse brought to life with the powder of life by Tip to carry Jack Pumpkinhead, whose wooden joints were wearing out from walking. He is a log with a notch cut in one end for a mouth, two knots for eyes and a branch for a tail. When he was first made he had no ears and could not follow directions, so Tip whittled him two. He also had a post installed on his back so Jack could hold on while riding. His friends deride him as the least intelligent member of their party, though he usually has intelligent things to say when he speaks.