They look like Japanese Bantam mixes. probably not directly with Silkie. No black skin or crest, or feathered legs. There are five major breeds with five toes. Silkies, Houdans, Sultans, Faverolles and Dorkings, plus a few regional breeds you are unlikely to see outside of their regions. Of these main ones, the one one that does not have either a crest, leg feathering or both is the Dorking, but they have white legs, which would be dominant over yellow legs. Therefore they do not have any of these breeds in the first generation, and are most likely multiple generation mixes, or the five toes could just be a genetic fluke, as polydactyly is a fairly common mutation to crop up 'randomly', because it can be hidden by other genetics.