Eric I'm so sorry for your loss. Please try not to beat yourself up too much on this. Sometimes things happen. We all try our best to prevent these things, but frogs can be very fast sometimes. We all underestimate just how quick they are at times. I agree with Tony the way you described him it would be best to put him down. Besides cats have a lot of bacteria in their mouthes and punture wounds or open wounds would surely get infected. You are in my prayers.