Re: Phyllobates Terribilis is not able to aim well..
This is where I say you shoud be doing some research on proper feeding and care. You should have had your feeders ready to go before getting the frogs. A variety in their diet is beneficial. Even if you get ff's in they will likely die out in a month or so and it is very helpfull to have culturing experience as they frogs can end up with nothing to eat if it go's bad.
How big are the actuall frogs? If they are adult Teribillis than pin head crickets will likely be easy for them to eat and pricey to keep supplying them with. They could actually thrive on Hydei ff and 1/8 crickets, Iso's and Pheonix worms.