Are silkworms good for bearded dragons?

Yes, they are very rich in nutrients and full of protein without a hard chitin shell that can be hard to digest like mealworms and superworms. The blue color looks a little strange but they are fine. Some Dragons don't like them as much as others, so I would just get one or two from your local supply store if possible to try it out, and I still wouldn't make it a staple, but as a treat once a week or so would be fine.