something in the red oak family - could be pin oak. The 'fruits' are most likely 'oak apple' galls

Hi new to florida, Looks like a lychee tree to me. And you have three of them?!

For future reference ...... Plums don't grow in clusters like that and even the smallest are larger than privet berries. Another clue is what is inside the fruit. Plums have pits. Privet and other berries have seeds. Also a key feature of plant identification is leaf arrangement along the stems. Plums are always alternate. Your shrub is opposite.

My favorite fruiting tree is Meyer lemon, mainly because I use more lemons than any other fruit. It is difficult to pick just one. The fig trees from Texas that I had in Venice produced the sweetest fruit of any fruit tree that I've had, but the season is not that long, and it got hot in the kitchen when I made fig preserves, which I mostly gave away. I also love my blood orange tree and cherimoya. Favorite non-fruiting tree is Ceiba speciosa (Silk floss tree), which makes beautiful pink flowers in the fall and has a very interesting spiked trunk.