My guess is they represent some kind of fruit but not an actual food that will be in the game. On the Tech screens for all the games, the graphics tend be more a representation of what will be gained rather than the item it's self.

As an example, if you look at the tech screen for VV3 The Restoration bar shows a hammer; saw and nails but these never appear in the game. In VV2 the medicine tech bar shows a mortar and pestle, but again they appear nowhere in the game.

I could come up with lot's more examples, but these are 2 pretty obvious ones that most people can verify.