Superworms are used by some here (Australia as a staple feeder for adult beardies) , IMO this is risky, I offer superworms as part of the diet but not everyday (maybe 2 - 3 supers 3 times a week with buk choi greens and crickets).
Tobacco hornworms are not available commercially here in Australia.
Some people give grape worms (I think they look like
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and they say their lizards love them.
If you want an ideal worm to use as staple I highly recommend silkworms , they are just about a perfect feeder insect. And most lizards go crazy for them. If you are north of the equator, they should be in season now as lavae , they are dead easy to care for , if you have access to a mulberry tree that's not sprayed , this is idea, apparently the leafs are a good green too, otherwise they can be fed silkworm chow (comes as a powder that you mix with boiling water and then nuke before using).
Silkworms will last 2 months while lavae and need feedings daily.
For small hatchlings I use small silkworms (1 inch long worms and their moths), for juveniles medium silkworms (1 - 2 inches long) and adult beardies will happily eat 2 to 4 large (3 inch) silkworms in a sitting).
