Great cover, fun issue. The mystery guest is the son of the Spidey villain Leap Frog, who is not the same dude.
The criminal’s son renamed himself Frog Man and is trying to become a crime fighter–to restore the good name of the character created by his dad.
The only real flaw here is that it takes an entire issue for Spider-Man and Torch to defeat Speed Demon. But it’s kind of explained because Frog Man gets in their way.
Even his sound effects are perfect.