Indeed, it is a form that is impossible to alter by any magic known to fairies or yookoohoos.

The wicked Giantess was well aware, when she gave you the form of a Green Monkey, that the Green Monkey must exist in the Land of Oz for all future time." Woot drew a long sigh.
"Well, that's pretty hard luck," he said bravely, "but if it can't be helped I must endure it; that's all.

I don't like being a monkey, but what's the use of kicking against my fate ?" They were all very sorry for him, and Dorothy anxiously asked Ozma: "Couldn't Glinda save him ?" "No," was the reply.

"Glinda's power in transformations is no greater than my own.

Before I left my palace I went to my Magic Room and studied Woot's case very carefully.