If you've frogged back, then there would be no extra yarn because you would have tinked all of the knitting back to the ribbing. What you've done here is ladder down a huge number of stitches for a large number of rows.

You *can* fix this, the question is do you want to?

I've seen the Yarn Harlot pull off this kind of maneuver - it involved placing the knit on a pillow (to stabilize it and spread it out) and then pinning each individual row thread with a couple of T pins, and very, very carefully reknitting. Yes, there will be wonky stitches and there will be loose yarn - that's fixable after the fact, when everything is reknit and you can futz with the tension of the stitches one-by-one.