Depending on where you got this critter, it looks like an American. I'd stay away from waxworms, they seem kinda hard for toads to digest. Stick with crickets,earthworms and fly's for the little one. He does look a little plump but it may not be from over-eating. I noticed that you have him in water and he seems to be clinging to the artificial plant in his home. These guys absorb water through their skin. He's probably over hydrated. See our responses to "American toads as pets". Toads seem to prefer their homes a bit dry. Just a little damp or even dry with just a shallow (very clean) water dish. I don't have standing water in my cages. I turn the dirt a little in their cages with my fingers to make sure it is not too dry. I mist them every night (twice a day if it's dry) when they are out and about. They will usually stand and soak it up. Remember, toads drink through their skin, anything contaminating their water gets soaked into their bodies, including chlorine so try to use spring or bottled water with nothing added (especially floride) for your toad.
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How to get your wife to like toads; 1.Get a male toad. 2.Get him to hug your wifes wrist (amplexus). 3. Tickle him so he chirps in protest. 4.Say "Awww, he likes you". Note; Make sure he pees first or you may receive bodily harm during this procedure.