Poor frog!

[BossFrog]

Aw poor lil boi, I know how you feel. Will you post pictures of him if possible? I suggest placing him in a paper towel lined container in the fridge for a bit, making sure to check on him every five minutes or so, and amputate when he's sleepy enough not to struggle too much but still conscious. In my situation, the frog didn't go to sleep in the fridge so I put her in the freezer but if you do this make sure it's for a very short amount of time. When you're ready to amputate, use gloves and sterilize everything with rubbing alcohol or similar. I used wire cutters for the bone and scissors for the rest... gross I know. Then I used styptic powder found at pet stores to stop the bleeding, this is very important as there are a lot of big veins and such in the leg. Sorry for the late reply and good luck, if you have more questions just ask!

P.S. you'll most likely have to force feed him for a while. I did.