Can multiple people/animal eat a single Devil Fruit? Provided, Chopper eats the Devil Fruit along with the other deers, will they all have the Devil Fruit ability, given that acquiring the ability only requires a single bite?
From the One Piece wiki:


  Only one bite is needed for the user to gain the power of a Devil Fruit, after which the Devil Fruit becomes a simple, useless, disgusting fruit


So I would say that the answer is no. Only one person/animal gets the ability.