first is def. Montipora, you will have to wait till it grows out more before you narrow it down.
second is Acropora, color looks like one of the nasuta,valida,nana,cerealis, but the growth form is throwing me. a lfs has one like it, my guess is A. cerealis
third i can't even suggest a family
last one, maybe A. tumida? it needs to grow out some to be able to determine growth form before i can delve into veron