Variety in feeder animals and healthy, well-fed feeder animals is always best, with a staple food like earthworms or crickets to cover the main food diet.

Check out the careguide here on the site Frog Forum - Toad Basics - Keeping ground-dwelling Toads. A care sheet for Bufo, Anaxyrus, Spea, Scaphiopus, Ollotis, Alytes, Pelobates