Electrical Questions? Ask an Electrician Online.
Hi, I'm Mike and I'll be assisting you. Please stand by while I review your question.
A double switch needs a minimum of 3 black wires to control 2 lights. The tab is removed if you have 4 wires and they are 2 separate circuits.
Unless it was incorrectly wired, green wires are grounds and should not be part of the switching. Do you have a 2 wire voltage tester? Can you check the wire colors at the fixtures?
Without testing, my guess would be a single pole switch.
Do you have a tester? You need test not guess.
I can't tell you to wire a green wire for a hot wire. That's why you need to test and check the wire colors at the lights.