Ianto caught the little change of expression but didn't make mention of it. It could be any number of things causing her to make a face and he didn't know her well enough (or at all really) to make a guess as to what it was. And, really, in these parts, River was much more common a name than Ianto.
The frozen food section was chilly, but Ianto had no problems with it nor the frozen food, so when they rounded the corner, Ianto looked with some interest into the freezers. Ice cream and frozen vegetables and those ridiculous little frozen pastries that Jack liked. "Are you adjusting well? Some days I wonder how people manage to do it so well. I think I'd be panicking a lot more than you are."