I would like to make the suggestion that you don't feed your frog goldfish. Goldfish are extremely "dirty" when it comes to fishes. A close friend of mine raises/breeds goldfish and always tells me how important filtration is for goldfish, because of how dirty they are. Also I wouldn't risk the chance of your frog obtaining a nasty parasite from eating a goldfish and/or some other nasty fungus/bacteria from sitting in water with the fish. If you want to give your frog some variety in their diet, I would recommend night crawlers and/or hawthorn caterpillars. Both of those are highly nutritious and don't carry the risks. Hope this helps.