Sorry, those are bantam OEGB or a mix. No dominique or barred rock of any size ever had that body/feather type and tail set. EVER.
Really, ever.
While smaller than a standard rock, a bantam rock still conforms to type - including tail set.
For the good news, they appear cute and healthy.
If you want to buy a specific breed - reading the standard or at least looking at the breed pictures til it sinks in... helps.
Barred Rocks are barred, puffy and a much lower tail set, yellow feet, with dark fronts no feathers on em.
Dominiques also have a significantly different body type and totally different comb and are cuckoo not barred.