I was having that sort problem on my old 5s. An upgrading app would hang and I'd have trouble getting it to complete the update or restart. All seemed to get there eventually but I know some never recovered and I was able to delete them. In a few cases, the deleted app(s) were not fully deleted as you can see like in the image below, an unidentifiable missing app. I've yet to find those missing app(s) nor have I missed ones that I used regularly since I remembered their names and was able to fully/successfully reinstall them.
Could the apps possibly still be in your iTunes if you backup and restore through there? I am just throwing out ideas. Once recently I had an issue where I restored and my apps would not sync back fully. That's not your problem, but it was very annoying and confusing to fix.