So can bearded dragons eat fish food at all?
No, they cannot.
As you can imagine fish food is specially designed and made for fish to eat and their diet is completely different than that of a bearded dragon.
If is possible that some of the elements in the fish food could be eaten by a bearded dragon but it isn’t worth the risk to give to a bearded dragon as you can’t be sure of all the other ingredients.
Therefore fish food is something you should avoid feeding to your bearded dragon.