Native plants nurseries commonly have 3 varieties- red tip (probably most commonly planted and carried at larger nurseries and big box stores), green tip, and the horizontal cocoplum (a coastal variant of the green tip which grows as the name suggests, primarily low and horizontal- typically maxing out a 2-4footish I believe.
There is definitely variation in the fruit and I know there is a type mentioned in the book Frutas de Brasil.
It’s a native to FL, it’s pretty, and I think it would be interesting to see if there could be improved cultivars. I actually kinda enjoy the fruit, most are just a fluffy sugar kinda of taste, but like you mentioned, but the nut is also edible and of decent taste. They’re no mango, not even close, but if you have the space or just see them fruiting around your neighborhood, I think they’re worth trying.