Reptomin turtle sticks are perfectly fine for these frogs. I can see why people would say it was not good for them. It doesn't really seem natural. But I've seen one of the moderators on here that feeds that to his frogs exclusively. You should probably have those be their staple diet but can give them some variety by feeding them tubifex worms and chopped up earthworms as well. If you feed earthworms, make sure to get farm raised ones to protect against parasites. Don't feed bloodworms, mealworms, or beefheart. Bloodworms have very little nutritional value. I use to feed that to my frogs because all the sites I went to said that was good food for them, but then they only grew to be about 2 inches instead of the 4 that they're suppose to be. I'm not sure why that food became so popular for them. Mealworms are high in fat and some people say it can cause impaction. Beefheart is also high in fat. Another possible food source would be the food found on xenopus.com. It is specially formulated for ACFs.
Be sure to raise your frogs on the Reptomin or other pellet food. I had stopped feeding mine that for a long time (because I didn't know better *sigh*), and now my frog is too spoiled and will not eat it. lol