Any chicken feed can be fermented. For baby chicks, I use their chick starter. If you have no chick starter available, chicks do just fine eating a all-flock feed such as Purina Flock Raiser.
It takes around three days for the feed to ferment initially, but by adding to the feed as you use it, it ferments faster. You will need to come up with a dish to feed it from since regular feeders work only for dry feed. I use dog and cat bowls. You want to add more feed as it ferments to get a good, thick consistency the chicks won't drown in should they decide to go wading in it. For that reason, for tiny, new chicks, I use very small containers they can't perch on.
Please go read Bee's thread on the Feeding and Watering Forum and all your questions will be cheerfully answered. It's an active thread that's been around for years.