Don't have a lot of childhood fruit memories. Being suburban we didn't really HAVE any fruit we didn't ourselves plant (except the wineberries) And not a lot of that. But to my memory the following stand out
1. Once upstate, we went peach picking. After a little while I got a bit bored ( it was still pretty young and short, so most of the peaches were out of my reach) So I wandered off carrying a punnet (just in case) and wound up on the edge of the orchard, where things had gone wild. To my surprise sitting in the scrub were some canes bearing very decent sized blackberries (note: I'm going to use "blackberry" in all these remembered cases, as I didn't know the difference. Some may have been blackberries some dewberries and some black raspberries) I wound up filling a whole punnet with them. Not only did we get some free extra fruit (the weigh people said they hadn't planted the blackberries so they really couldn't charge for them) but it turned out my family liked THEM a whole lot more than the peaches (it wasn't a particularly good peach year)
2. One while wandering in the scrub behind our house I wandered into the scrub behind the house next door. On top of one of the rocks there was a bramble running, again having a (ONE) very nice sized blackberry (in retrospect this one probably WAS a dewberry, since it was trailing) This was an exciting find since I though we had no wild blackberries around us (at that time there was a pretty substantial bank of blackberry canes in a sort of dip between our next door house and the one next to that, but the berries were useless; tiny, sour and all seeds. It got taken down when the built the new house between the two)
3. Around when I was ten, I used to sometimes during the summer walk down the mile or so to the train station and meet my mom as she came home from work. On one side of the road at one point of this, there is a deep gully (really deep, our car actually fell into it once on an icy day, and none of it was still above the level of the road) that led up into the back of a woody area (that, if you walked all the way through it , apparently comes out on the other side of the soccer field on the highway. When I would walk it, I would often skirt the edge of this gully since the fauna there had some interesting stuff (like witch hazels and toad lilies) One day I was astonished to find and apple tree there, laden with fruit. That there was a feral apple wasn't astonishing (lots of people around had have big apples in their yards) it was that the fruit was completely undamaged and the tree straight (most of the apples around here are wormy cankered messes by the time they are sort of ripe, and the trees twisted and cankered (or why there are so few still around, eventually most of them got too twisted to be stable and were taken down to protect the houses) Alas my parents would not let me try any of them (their reasoning was that a wild apple that had no bug damage was probably poisonous. ) But they sure looked good. Really would like to find that tree again since a pest resistant apple would be a valuable thing, and I have to assume the tree was wild