Hanhart syndrome (also known as Aglossia adactylia; Hypoglossia-hypodactylia syndrome; Peromelia with micrognathia) is a congenital disorder that causes an undeveloped tongue and malformed extremities and fingers.
Notable cases
Nick Santonastasso, actor, Instagram star, and YouTube prankster, who has no legs and only one arm. [Source: Wikipedia 
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