We also have a potato-like : word "patate". "Pomme de terre" is déformation of "parmetière" from the name of M.Parmentier who introduce potatoes to the french population.
Literally, “apple of [the] earth”. The word pomme used to mean "fruit" in Old French. The French construction originated, as calques, Dutch aardappel, Icelandic jarðepli, Persian سیبزمینی (sib-zamini), Modern Hebrew תפוח אדמה (tapúakh adamá), the rare English earthapple, German Erdapfel, etc.
In fact, apple was a catch all term for fruits in many languages from time to time, hence pineapple (originally meaning pinecone, later used for the exotic fruit because of similarity) or German Apfelsine (orange, literally apple from China), ...
That's actually not true, 'ground apple' is a common name for different sorts of tubers in a number of different languages, going back to the latin 'malum terrae'.