Well, if you got them from a feed store or other local supply then they are certainly not English Orpingtons, but American buff orps are very common and look a lot like a buff rock, just with white/pink legs and skin and a very petite single comb. They also vary in shade quite a bit. Some are...
It really is too early to tell for sure, they are clearly "buff," but they could be Plymouth Rocks or Orpingtons (or leghorns for that matter). Wait until they get a little bigger to look at comb size and body type to be sure, but just based on what is most common I would guess American orps.