Barnyard because when all breeds are allowed to mix, they create these new "breeds" which are not true breeds. Only breeders, not hatcheries, that control what hens and roos mate will produce pure breeds.
There is no such breed as Americaunas. It is simply the merchandiser's way to sell the barnyard mixes we backyard chickeneers call Easter Eggers because they lay colored eggs!
P.S. That brooder is NOT big enough so plan on changing it to something bigger very soon. That can even be a large cardboard box like appliances come in.
Most likely you have 2 Easter Eggers which will give you some beautifully colored eggs. Depending on the size of the brooder, they will be fine if you put a wire over it to keep them in. Good luck.