it's a local name. basically one of the locals got this many years ago when aquacultured stuff first started showing up. it was on a frag plug that looked like a hockey puck (which we had never seen before). and we figured rather than keep calling it 'the frag on the hockey puck', we'd just call it 'hockey puck'.
i've come across several similar corals since then, and i've seen some pics of hiller's aquadelight that look identical (but then sometimes other pics where it's completely diff so who knows).