Could just be taking a few days to settle in. I've had fussy frogs that won't take crickets though, so you can always try small roaches as a stable just now. These are best kept warm as they might not feed on a gutload diet if kept cool. Earth worms are also a favourite and their nutritious. Variety is best

Your temps are spot on but with heating on 24/7 mist at least once a day to keep the air a little humid. You don't need the moss, but some good sphagnum moss will do you good for keeping humidity up. This is a different moss than what's included in the kit, you might do better with this but when using it be careful the frog doesn't eat any, so feed by tongs. With the other moss moulding it was probably kept too wet or have you reduced ventilation? Make sure not to reduce any ventilation when using the ceramic in this size of tank because this will trap heat and prevent a thermal gradient.

You should use the dechlor to be safe, chlorine is most dangerous to tadpoles but not healthy for juvenile and adult frogs either. Frogs need high-quality water with out any of the nasty chemicals in order to thrive. It's just good practice to dechlor the water unless it has been ran through a filter or is good quality bottled spring water.