This is a plant that sprung up in a spare flower pot in Zachary Louisiana. Its a fast grower. The picture with the measuring stick is a yard stick. The last picture is a picture of the trunk.
your plant is Amorphophallus konjac, often called Leopard palm or Voodoo Lily, and it is related to the famous corpse flower, Amorphophallus titanum. It has a large corm like that of its relative, the Jack-in-the-pulpit.