... did you read the rest of my post?
Frogskins are based on popular frames from the 80s, which were based, like was pointed out by the guy a few posts above, from the 60s.
Espirit Wayfarers from the 80s.
The style of frame is called "Wayfarer"
just like "Aviator" or "twin-tip ski" etc. It's not a rip off, it's a style