You could have them caponized and that might help with crowing, but I'm not sure that you'd be able to find a vet to do it and it might cost an arm and a leg since they are considered exotics, strangely enough. You'd have to find an avian vet and see if they would do it for you. From the light color remark it sounds like they are male red sex links.
I had 3 roosters caponized at 7 weeks, only 2 survived and neither crows now at 1 year old, they are more just like overweight hens.