You could add them to the salad or something, but they definitely could not replace the insects you feed your beardie. They are worthless, nutritionally. For the insect percentage or your beardie's diet they need to be live, gutloaded insects.
I don't know if your intention was to replace live insects or if you were just asking of you could use them at all. Since they were free, just mix them in with the salad and call them croutons!