Sawhorse

As the books describe them

The legs of the Sawhorse were four sticks driving into holes bored in the log; its tail was a small branch that had been left by accident and its mouth a place chopped in one end of the body Dorothy and the Wizard in Oz, ch. 16

Its hoofs, or rather the ends of its wooden legs, were shod with plates of solid gold, and the saddle strapped to the wooden body was richly embroidered and glistened with jewels. The Road to Oz, ch. 21

The Sawhorse wore wooden shoes to keep his wooden legs from wearing away, and he was strong and swift. The Emerald City of Oz, ch. 9

The body had been formed from a tree-trunk, and a branch had been left sticking up at one end that looked very much like a tail. In the other end were two big knots that resembled eyes, and a place had been chopped away that might easily be mistaken for the horse's mouth. The Marvelous Land of Oz, ch. 4

he looked to be nothing more than an animated chunk of wood The Marvelous Land of Oz, ch. 20