I don't think the superworms will cut it for a diet. Sometimes toads of the same sex are more prone to bullying so if they are the same sex that's possible but toads in general are greedy so you can't role out the toads just being greedy. If you have a bigger tank you can throw food to both of them different times at feeding so one is on one side of the tank eating and the other is eating on the other side of the tank. Earthworms and Crickets would be the easiest to attain and to feed the toads. I am curious about red worms too? I know if your toad dislikes the smell it gives off they will reject them and never touch the red wrigglers again. I've had toads eat them and stop, I've had toads not accept them and toads eat them until they died of old age or being released (mine were native to my area). The red wrigglers are more of a chance food if the toad will accept them or not so it is best for this toad who is weaker to eat something you know it will certainly take.
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