Why do the Americans call it “egg plant?…. and a tale of two fanny`s”

“Used in present-day English chiefly by America speakers as a synonym for the aubergine, aubergine was originally applied specifically to the white-skinned, egg-shaped variety of the vegetable. This was in the mid-eighteenth century (available evidence suggests that the term predates aubergine by about 30 years). By the middle of the …