Scoodlers

As the books describe them

It had the form of a man, middle-sized and rather slender and graceful; but as it sat silent and motionless upon the peak they could see that its face was black as ink, and it wore a black cloth costume made like a union suit and fitting tight to its skin. Its hands were black, too, and its toes curled down, like a bird's. The Road to Oz, ch. 9