What fish do you have them in with? Some are too aggressive to be with frogs, and I know a lot on here feel frogs shouldn't be with fish at all. I personally feel it depends on the fish but I know that view isn't shared by everyone. I feed my fish about 30 minutes before the ADF's so that they're less likely to be interested. With mine I use a pipette, so I'll defrost the food, add water and then suck it up in the pipette. I'll hold the pipette right above the ADF's mouth to make sure they get it. I'm training mine to come to the top of the tank for feeding as well, my fish are all bottom feeders (cories) so this helps keep them away at feeding time.
They really do need additional help at feeding times and aren't very proactive in finding food so it's a bit of a waiting game until they learn what you're doing.
Also ADF's are social and like being in groups of 3+ if you have capacity for more.
