Try fruit flies, I left a chunk of banana in my FBTs enclosure and they eat the flies that are attracted to the fruit. or leave a culture jar in the enclosure with holes big enough for the flies to leave, but small enough the toads can't get in.. of course you need a fly proof lid then.
OR let a few adult crix lay eggs in some soil, then put the soil container in the enclosure and let the crix hatch out in the enclosure with the toads.
or try tiny mealies.
mine eat fish flakes sometimes.. and earthworms parts too..
here's a great site I found
http://www.amphibian.co.uk/bombina.html
it says
During the active period these toads will continually capture a devour many invertebrates ranging from crickets, waxworm, earthworms, mealworms and sweepings (brushing a butterfly net through a meadow or grassy area will trap a wide range of insects). The secret is to provide a wide range of foods which should be occasionally supplemented with a special herptile multivitamin powder. I like to occasionally give my own specimens strips of raw fish (white baits) and lean red meat or chopped pink mice offered on tweezers. Adult B.maxima will even take whole pink mice but this should not exclusively form the diet.
I'm looking for some fire bellies, so if you decide to sell them let me know. 
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