ADFs can smell food and will eventually find it as long as no fish eat it first. I know that people will net the frogs into breeder boxes and feed them in there.
Not from my experience. I've had a lot of them. If its not right in front of them they just do their own little thing. Next time I own one I'm buying the turkey baster and doing that idea. Not kidding they are tricky and I've NEVER seen them eat leftovers that were more than an hour old. Even 20 mins old.
20 gal planted-1 Dwarf Puffer, 1 South American Puffer, 2 Red Eye Tetras, 2 Serpae Tetras, 2 Siamese Algae Eaters, and some random ghost shrimp meant as food. Have 2 ten gallons empty so help me decide (maybe Betta and ADF and a shell dwelling Cichlid tank. Open to suggestions) Visit my T-shirt store http://www.moronsarefunny.spreadshirt.com