Hmm when he jumps the on the glass does it look like he is trying to escape? If so that might be a sign of a dirty enclosure. Female dubias are pretty big right? Have you tried uncut nightcrawlers? That's all my Mojo will eat. Anything smaller than that and he will look at me like I'm crazy. He likes big prey that is worth his time. And agian, does your frog take the nightcrawler when you rub his lips? I do that for my Mojo, its nothing to worry about. When you rub thier lips with the food its just telling them that dinner is ready.