Try putting him in some very shallow (just enough to cover most of his body but keep his nostrils in the air) water in a covered container (Tupperware even). He is probably a little shocked, stressed, tired and sore from his adventure. They start drying out very quickly and their muscles are primarily water. Dehydration makes it very hard for them to swim for a while afterward.

This is a learning curve. We have all been where you are. Don't give up due to a few hiccups. I have been exactly where you are. I didn't start out knowing a lot about frogs...I learned and most of the early learning was just because I kept screwing up and was trying to figure out what the heck was going on.
Wrong species bought? Check. Wrong tank set up? Check. Jumping frog? Check. Wrong tankmates? Check. Putting frogs together too soon? Check. Wrong food? Check. The list goes on and on. A few months from now you will be the one giving advice to other newbies.