I've had my Tropical Gars for a week now and they've grown outstandingly fast. I purchased them at around 7-8 inches and now they are around 8-9, depending on which gar. Photos aren't real good but here they are:
When I bought them I was unsure too actually, but I look at their snouts and their fins. I even had a florida right next to it for comparison which greatly helped. I agree with HungDang, if he is saying they are definitely Tropicals.