Throg has an idea. He'll use some poison on some provisions (provided he has some) and throw it out for the rats to gobble up before they attack.
If, on the other hand, there is, let's say, a 0% possibility that that idea will work, Throg will poison his sword and administer the dosages intravenously through the rats' buttocks, necks, eyeballs, rib cages, etc.
Edit: Also, he'll try to kill the bats, since they seem to be the only creature within reach at the moment.
Edit 2: Speaking of bats, did I mention on here that I had a bat in my bathroom a few months ago? Apparently, it fell asleep on my shower curtain, so when I went to take a shower and opened the curtain, it fell out onto my foot. So I closed it in the bathroom and later locked my wife in there with the bat so it could flutter around and scare her. Eventually, it settled onto our AC vent and we caught it in some Tupperware and released it outside. So... I forgot what's in my inventory, but if Throg has Tupperware, he'll attempt to use it in order to trap one of the bats.
Edit 3: This post reminds me that I need to update Crapstorm.