I'm convinced DD will crawl before she rolls over. She doesn't even try to roll, but when she's doing tummy time and I put toys just out of her reach she will make her legs frog style then push them up under her so she's on her knees and scoot forward! We're doing the naked tummy/back time after bath every night on a towel.
I know they do everything on their own time, so I'm not worried at all she hasn't rolled yet. She's one of the "older" babies on here with a 7/28 birthday but was a 36 weeker.