bro... grape is already a fruit.
Grapefruits taste nothing like grapes, and even if they did, it's completely stupid and unnecessarily confusing to name a fruit after another fruit and think it'll be fine to distinguish between them by just adding "fruit" to the end.
Supposedly they weren't named after the grapes we know, but after a different fruit that looks like grapes called the seaside grape, which it may or may not taste like.
Doesn't change anything, it's still completely stupid.
We shouldn't use senselessly confusing names just because some settlers came up with them hundreds of years ago. Just make an original word for christ sake.
Also ♥♥♥♥ "eggplant"