try buying frozen blood worm pellets, you can melt them in water then with your fingers grab a small amount. when you see your frog release the worm above it. the frog should notice them and grab them. i have a young ACF that is what i do and i have had no issues, seems to find the worms that fall to the bottom fairly easy. just make sure you do not drop to many in or the frog could over eat and get a big belly. if that happens try not feeding for a day or until belly returns to normal.