Those chicks could be BBS Ameraucanas. (Blue Black Splash).
They'd have to meet the standard of perfection. One looks to have feathered legs - so that's an EE (Easter Egger).
None should have single combs.
No problem :) This is how it was explained to me .... The color, "blue," in the animal world is a grey shade, such as a blue heeler dog (it is grey). Grey chickens are called, "blue." Lavender is also called, "self blue," as another term. The easiest way to tell the difference in blue and...