how big are they? If theyre really small I used to feed my little striped marsh frogs aphids or pinhead crickets.
Aphids can sometimes be hard to find though (its strange because they seem to appear as soon as you dont want them anymore) But pinhead crickets should be available at pet stores, though im not 100% sure about in QLD.
we are feeding ours tiny crickets , but also put a small amount of fruit in a small dish, to attract fruit fly.
we have lots of fruit fly around the compost scraps in our kitchen so that works well for us!
The fruit flys are good as long as you make sure there is nowhere for them to escape otherwise youll find them out of your frogs enclosure and all around the room.