Greetings Gunnwong,
You can feed them, but will they eat?
Problem, is they need live food. I think it has to swim. If they eat the dead food, they will not eat it all, and what's left, will foul the water. Ammonia will then kill them.
Dead food has been tried before. I think the consensus is it is easier to culture rotifers than to try to raise clownfish with dead food.