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i just googled tallow plum. i dont think i have ever seen one. apparently there are a few types of wild plums...
http://www.eattheweeds.com/chickasaw-plum-yum/

and then there is tallow plum: ...

even without it, those hog plums are pretty sour.

we used it kinda like lemon. worked well for a marinade for meats. it would probably work well for making wine as well if you mixed it in with...

as a kid, i used to make a syrup out of something we called "hog plums". if memory serves me correctly, they were american plum trees(or something like that).

i used to crush the fruit, soak them...