It's been said but it's crazy how much people think trades work. A 4th for Fromm should get the Atlanta GM fired.
1. They're most likely not going to be good this year, and you don't waste draft capital in a year where it won't make a difference.
2. They (and everyone else) know that Fromm is going to get cut. You offer a 7th if you really feel like he's worth having on your team and don't want to take the risk of someone else picking him up on waivers (but the Falcons were terrible last year so unless the Jets, Jacksonville or Texans want him they'd have dibs anyway.)