Well, I figured out why he was acting odd.

I've been using fishtank dechlorinator, since the store where I buy my supplies was out of reptisafe.

I read somewhere that the fish dechlorinator can hamper proper shedding due to mucus coat enhancers for fish that make it hard for frogs to shed. I could tell he was shedding, but upon further inspection, he had shed skin stuck to his body. I used a wet cotton swab to remove the shed skin, and he almost immediately returned to acting like a WTF; he jumped on a cricket I gave him and scarfed it down.