They are a tangerine, but I'm not sure about the hybrid part.
https://justfruitsandexotics.com/pro...angerine-tree/
https://www.specialtyproduce.com/pro...ines_15936.php
Most plants that I have seen are grafted onto trifoliata rootstock, which tends to dwarf the plant quite a bit. We bought one from a local Lowes or Home Depot years ago, and it has gotten quite large. Matter of fact, it is the tree in the photos above. We had it for several years and although certainly big enough to produce fruit, it was just not even producing flowers. So one year after yet another disappointing year of production from it, Connie and I were standing near it and discussed cutting it down to replace it with something that would actually give us some fruits. It must have heard us, because the following year it flowered like crazy and gave us a heck of a lot of fruits. Seems to be sort of an alternate bearer, but even on the off year will still produce some fruit.
If you can grow citrus in your area, this is the one to get if you like tangerines. Seems to be moderately cold hardy, but if the temps drop below 22 or so, there will be some leaf damage.