What are the objects that eat Devil Fruits?
From what we know, there are only 4 objects that ate a devil fruit : 
(Note that these are only Zoan Devil Fruits)


Lassou : A bazooka that ate Inu Inu no Mi (Dog Model)



   





FunkFreed : A sword that ate Zo Zo no Mi (Elephant)



   





Rakuyo : a "scourge" that ate an unknown devil fruit



   





Smiley : a mass of gaz that ate the Sara Sara no Mi (Axolotl Model)