50 years ago I was keeping Anaxyrus americanus Toads and I had several for a little over 10 years. They thrived primarily on mealworms which at the time was the only insect available at the local pet store, and as many other arthropods as I could collect for them to eat during 3 months of the year. They lived an average of 4 years as re-introduced wild Toads in and around the compound after I released them.