You can clip your chicken's toenails. Use a dog nail clipper, just like on a dog.
Just be careful not to trim them too short. They have a quick, like the dog nails, and it will bleed. If you quick one accidently, you can dip the nail in Knox plain gelatin powder to make it stop.
I I think you can clip a rooster's spurs, too. I know someone who does it, just to blunt them. Seems like a good idea to me.