I can't see the comb clearly on the 4th chick, but it could possibly be a Buckeye (if it has a pea comb.)
When I had Buckeyes, I was surprised at how many colors and how much patterning they had when they were young--much like that chick. Then they grew up to be the usual black-tailed-brown, and all the patterning and extra colors disappeared.
Various other breeds can have patterns in their chick feathers that look very different than the adult pattern, too. Buckeye just happens to be the one on Hoover's list that I have personally seen.