OK thanks to everyone for solving the mystery!

I gather up those small oranges, and use them in orange-ade… one orange to a half gallon of water… I’ve also experimented with using them in other recipes… These babies are supposed to be hardy up to new England! I got busy looking for other hardy citrus we could grow in middle GA, and found this neat file produced by the Alabama extension service: http://www.aces.edu/counties/Calhoun/documents/HardyCitrusforCentralAlabama.pdf At the bottom of the pdf file is a list of nurseries where we can purchase these hardy citrus trees.

Looks like “hardy orange” – Poncirus trifoliata.