This reminds me of the paw paw (not to be confused with the papaya which Australians call pawpaw) https://www.npr.org/sections/thesalt/2017/09/15/550985844/th... It's a fruit that seems tropical, a close relative of the custard apple or sitaphal that tastes like a pina colada. Yet it grows natively all over the eastern US. It's so common that in many places it's every third tree in the forest. I grew up in peak pawpa…
They are also, like you note, absolutely delicious. I have two trees in my backyard. (You need two for them to pollinate and bear fruit.) But there are practical reasons why you don't see them for sale very often.