I talked with Bryan Cox the other day about Corsair squadron call signs, and though he cannot recall any other squadron's radio call signs, he said that when his squadron, No. 16 Squadron, was operating alongside other Corsairs squadrons as a Wing in attacks (and often two or three, and sometimes even four of the RNZAF's Corsair squadrons would make an attack together) he said No. 16 Squadron was known as Onyx Squadron.
So while flying by themselves radio calls would be for example "Red 3" or "Blue 2" to alert a particular person in a particular section that the call was for them. but as each squadron had a Red, Blue, Green and Yelow section (four aircraft each) the squadron callsign would be used and so it would be "Onyx Red 3" etc.
I would love to know what the call signs were for the other units. So far we know: