Hmm interesting! I have had Easter Eggers with black spots too and a mix of single comb and pea comb but I bred them myself. But still. It is possible. So I guess you will have to wait and see what color they lay lol
With the black spots though, I don’t think they’re either. I think they’re likely a Leghorn mix like Hoover’s California White or Ideal’s Ideal 236. Most likely the California Whites given TSC usually sources their chicks from Hoovers.