Wild strawberries sound great but they are tiny, ripen very unevenly and don't even taste that exciting.
The breeding of grapes clearly continues, in a stall not far from me I can see grapes for sale that are literally the size of small plums. (edit: cultivated plums that is. Wild plums, you're welcome to them, small and sour https://en.wikipedia.org/wiki/Bullace https://en.wikipedia.org/wiki/Sloe)
Whilst food tends to be much smaller, bitter or sour, tougher to chew, lower in sugar and would not sell in a supermarket.