I also thought maybe a young 'Curly Fries', but there are several newer hostas with long, wavy leaves. I'd watch it during the season and note whether it changes colour (CF will become more yellow). Also note the shape of the mound, when it blooms, the colour and shape of the flower and whether it's fragrant. All of those things would be helpful in making an ID.
This is what my 'Curly Fries' looked like when I'd had it a month back in 2012.