Mr. Joker
A clown made of china who is covered with cracks from being mended repeatedly after frequent falls.
First named in The Wonderful Wizard of Oz, ch. 20
Now there is Mr. Joker, one of our clowns," continued the china lady, "who is always trying to stand upon his head
As the books describe them
Indeed, a jolly little clown came walking toward them, and Dorothy could see that in spite of his pretty clothes of red and yellow and green he was completely covered with cracks, running every which way and showing plainly that he had been mended in many places. The Wonderful Wizard of Oz, ch. 20