In the latest show, Shane said that some of Superfrog's powerups predated similar items in some Super Mario games. Well, Superfrog is 1993. Super Mario Bros 3 was 1988 in Japan and 90 and 91 in the US and EU repsectively. Mario 3 is the game that introduced the Racoon and Tanooki powerups. You didn't just hover either as both allowed you to fly.
Even Super Mario World on SNES predates Superfrog as it was released in 90 in Jpn, 91 in the US and 92 in EU (and there I was thinking I bought them when they were new and not 2 years old).
I have not played SF at all and probably wont. It might be snesational and all but let's not get carried away and say something silly like it wasn't just a total Mario rip off.