Yes, you should bump temps a bit, although 79 is not tragic. To raise temps I suggest you suspend lamp above the critter keeper, this way you can raise temp without melting anything. Ceramic heat emitter would be your best.

do not feed superworms or mealworms, they contain chitin that frogs can't digest and put your frog at risk of impaction. I would just put a few guy loaded crickets in there, frog should hunt them down
have you covered 3 sides of your tank?