What are Tetra chickens exactly?

[HarmonyFox]

What are Tetra chickens and how many subtypes are there? I have a chick I got from the assorted tetra tub at tractor supply and I assumed it was a tint because it has white and brown feathers but I didn't see anything about them being large. She's with 2 turkeys and she seems to be on track with my palm turkey in terms of hight. I looked up more and I saw that there seems to be more subtypes than I originally thought. Could anyone help me learn more about these hybrids?
Mine is 4-5 weeks at the moment.