Sorry for the late reply.
ADF do best if fed frozen or live food and, occasionally, food specifically for aquatic frogs. Fish and other foods will cause them to bloat. If you are feeding two pellets, once a day, of aquatic frog food it is not enough, IME, to sustain them.
If they have never before been fed pellets the little one may not recognize them as food. Get them frozen bloodworms (the staple of my ADFs' diet) and feed one or two at least twice a day but three times while they are growing is better. You can thaw a small amount in the fridge in a pill bottle and they will stay good up to 10 days. Do not worry about getting them room temperature as they are warm enough almost as soon as they hit the water.
Yours are small because they are wee babies. They will eventually reach one inch.
If your dog thinks you are the greatest do not seek a second opinion