I am new to the forum and just a hobbyist so someone more qualified may have the answer to this but I thought African Frogs were completely aquatic and would tolerate dried food like the commercially available frog bites in the fish sections of pet stores? However the picture of your frog does not look like the African Water Frogs I used to have. So I don't know for sure if we are talking about the same species here, but mine lived happily in a 20 gallon filled just enough for the filter to work the filter and with a lot of floating plants to rest on at the top and they ate frog bites and fish food with a brine shrimp treat on occasion. I eventually gave them to a school teacher but had them about 2 years before that. That is my experience with African Water Frogs. So I would double check which type of frog you have, you may not have to worry about your wife not feeding live food while you are gone because I think African Water Frogs are the exception to the live food rule. I hope this information helps. Does your frog ever go on to the rocks?