I'll add peppino melon and youngberry. Not strictly trees, but good and heavy yielding subtropical/tropical crops.
Muntigia (pananama berry) is another super heavy yielder. All papaya. Mangoes too.
I'd love to know more about the fruits you mentioned, Peppino-melon, youngberry and Muntigia (panama berry). Unfortunately, I only found a few pictures and snippets of info about these fruits on the web.
These fruits seem to be on the same pabe as muscadine grapes, although they're totally different.
You describe them as "good and heavy yielding," that sounds like it may be very worthy to grow them in the home yard.
Summary: More info on these fruits, please!!!!!
well, in my opinion peppino melon is the only solanum worth growing, because almost all of the time, I fucking hate solanums. This includes tamarillo and tomato, which despite being a fruit, is not a fruit that I accept as being a fruit.
Peppino melon is easy to grow, is spineless, has nice looking foliage, will tolerate a wide range of soils and has extremely good pest resistance. Has a similar taste to piel de sapo melon. You can grow them very easily in pots, and they don't present a weed risk. They produce abundantly.
Youngberry is a very, very, very tough fruiting vine. Very tough. They will handle drought excellently, and baking, life-destroying heat very well; put it this way, if they can handle what Australia has to throw at them, they can handle anything other than the Arabian desert. They produces masses of very delicious berries which are not sickly sweet and have a good amount of astringency that isn't overbearing, and don't send out the kind of ultra-invasive runners of something like blackberry and raspberry--things which aren't worth growing in the subs and aren't even worth considering for the tropics.Nice flowers, beautiful foliage, can be trellised into interesting shapes. Pretty much the perfect vine to grow IMO. I'll take some pics of mine in a minute and post them--I just ripped these out the ground and put them in a pot (they wilted for exactly one day, and then started flushing out new growth the next--they are that tough).