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Tony Tony Chopper is the doctor of the Straw Hat Pirates. He is a blue-nosed reindeer, who gained human properties by eating the zoan-type devil fruit called Human-Human Fruit . The fruit-granted ability allows him to change between three forms. His first and original form is that of a reindeer. In his second form, he has the proportions of a human child, while retaining his antlers, hooves, and fur. In his third form, he looks like a brawny man with fur. In addition to his normal transformations, Chopper developed a drug he calls Rumble Ball , which allows him to assume four additional forms for the duration of three minutes. 

Source from Wikipeida