A play on the term "Tomato, Tomahto". Like saying "Same thing!" about two things that aren't the same at all. Most fruit and vegetable plants of the same family, including potato and tomato plants of any variety, can be grafted to create one plant. The upper part of the. Feb 19, A mutant plant with the bottom of a potato and the top of a tomato grows both foods at the same time. But why?.