Welcome to R2R and the hobby!
Second one looks like a pavona. Last one looks like a ricordea.
PRO TIP: Don't buy anything if you don't know what it is. Different corals need different conditions to live/thrive. You'll need to know their care requirements (lighting, flow, nutrients, etc.) before you put them in your tank.
SECOND PRO TIP: If you're buying from a store where they don't have any information on what they're selling...it's time to find another store IMO.