If we had codewords for anything this year i didn't know about them, atleast for like just counselor things. Actually now that i think about it, i don't know any emergency commands either because i don't carry a radio on me!! Anyways two years ago there were codewords they were:
Painting= Smoking
Sailing= Drinking
Playing Tetris=Hooking up (I don't know why it was tetris and i only heard this one once during camp anyways)
That was it, i was also a CIT at the time so thats all i got.

I'm sure that there are commands that we have for over the radio, but typically if there is ANY form of an emergency at camp we have an air siren that goes off alerting everyone.