Pea combs are a small row of bumps (kind of like peas in a row) while a rosecomb tends to be somewhat flat and wide. I would bet you have a Columbian Wyandotte.
I believe they are more like a pea comb. Just a tiny row of bumps. I'm going to have to take those pics soon. The one time I had my phone back there and thought about it, they all ran under the coop like they were camera shy!