Is it possible to undo the change by editing the save file somehow or console commands? Any work around other than reloading an old save game of which could send me back more than a dozen hours if have to do so...it must record in the save file somewhere that you are under status effect of some sort so if was possible to edit that save file might be able to undo that.
If anyone is good with hex editing I ran back to the location from earlier save (skipped the many hours worth of stuff did on original save) and then did a save before chest and save after opening and changed to frog in same spot. The only difference should be one is closed chest and still human and other is open chest and is now frog.
Here is first file from prior to opening chest that I think stores all character data aka the actual save game 'data' file.
http://www.filedropper.com/data_6Here is second file after opening chest...
http://www.filedropper.com/data_7