This thread gets weirder and weirder. Toe straps on Frogs?
Two methods (same as on Speedplay Zero's): First, remove one of the allen bolts on one side and reinsert with a loop of steel underneath (most simply cannibalized from the toe strap loop on the top of a toe clip). You can also just punch a hole in the strap and run the bolt through it, though I don't really recommend this method. Second, clamp the strap into a second Frog cleat and simply clip it into one side of the pedal -- the pedal is now effectively one-sided but has a strap.
Yo, folks, toe straps don't belong on these things. Either some of you are going crazy because you can't get out to ride any longer, or you just need to think about why you're putting straps on. I know straps are cool on messenger fixies, but straps on frogs on the track are an accident waiting to happen. Are you actually disengaging accidentally from your Frogs? Those pedals actually hold pretty well, so you're probably creating more of a problem than you're solving anything.