three in the green? In 25 years of flying in the States I don't think I ever said that. At some military/civilian airports the tower will say confirm gear down.
Yes, mainly at airports where the ATC is run by the ANG/Military.
ATC: 'Check gear down, cleared to land 26"
Pilot: 'Three in the green, cleared to land 26" (even said it when flying fixed gear aircraft!
)
also
Pilot: 'Skyhawk 1234E requests the option'
ATC: 'you have the option' or 'cleared for the option'