Welcome to BYC! Please make yourself at home and are here to help.
Most chickens act crankier and more aggressive during the molt. You can't blame then! LOL Once they grow their new feathers, their behavior should return to normal.
Make sure to give your birds extra protein as Judy said. Feathers take up 85% of a chickens protein so obviously they need more when molting. Mealworms, oatmeal, eggs, meat scrapes, peas and quinoa are all great food with high protein content.
I've never heard of roosters who stop crowing during the molt.
Good luck with them and welcome!