CRETINS! ALL OF THEM!
Fire Lad often breathes fire by accident, since there's a chance of it happening any time he exhales. If he sneezes? Run.
The "giant turtle" there references Jimmy Olsen's Silver Age monstrous alter ego, the Giant Turtle Man. While never a formal member of the Legion of Substitute Heroes, there is an infamous Silver Age story where LoSH member Colossal Boy dresses up as the Giant Turtle Man so he can, more or less, just screw around with Jimmy's head.
The Silver Age was not kind to Jimmy Olsen :laugh:
I got a 'Showcase presents: Superman Family' and its filled with ridiculous Jimmy Olsen and Lois Lane store :laugh: I got plenty where Jimmy got powers but I don't think I got Giant Turtle Man