Hello and welcome to BYC! Glad you're here.
Don't look like Australorps (way to much white and the pattern is off).
However, they are definitely not White Rocks.
They look a lot like Anconas (very pretty egg laying breed).
I can't say 100% positive on that though.
I would post a pic once they feather out more (a month or so) to get a sure ID.