Until they get a bit larger it can be difficult to properly ID
these types of coral. Once they get a bit larger, the growth patterns and corallites will be more evident. I will throw out a guess though.
Unknown 1- Acropora haimei or formosa
Unknown 2- Montipora Digitata (needs to get a bit bigger?)
Unknown 3- Acropora nastuta
Just guesses though. I could be way off.