One more time.....

It should be fine to feed them as long as they have been moistened.
I would not recommend to feed it as a staple diet, but as a variety to offer.
The color enhancers do not cause any issues as far as we can tell after 4 years of using the mentioned foods in raising our tadpoles & frogs.
The fish pellets can also be used as a treat as long as it is a carnivorous formula and again, moistened.
Although they are made for easy digestion and will probably break up easily in the digestive tract, why take the chance of causing an issue? Just pulverize it, make a dough and tong feed. Or soak it until soft and tong feed.

I am just trying to help answer your original questions. I don't know everything. But we have all been weighing in to give advice from experience. Hope it helps.