these are seramas. smaller then bantam. a breed all their own but to answer your question, yes, you can get just about any breed today in bantam size. the fact is though there are very few "true " bantam breeds . I dont know what they are , maybe some one can enlighten us.
D'anver is a true bantam breed and one of the oldest. I have some but I am getting out of them and concentrating more on long tails.