The same as all chickens, just about everything. Commercial feed, grains and seed, bread and vegetation of all kinds. They love bugs and worms,spiders and flies. Try giving them cold cooked...
You don't say how old the chicken is. Cockerels will develop comb and wattle much faster than a hen and spurs on the back of the leg will appear as small bumps by the age of six months. Cockerels are...