Don't understand what?

Trust me, the frog smell will overpower the worms... And I doubt he'll pick them out. I've done this before (not frogs) and it works.

If you don't like the idea of chopping frogs I totally understand. If you're ok with it, it's easier, and less messy whole frozen. Put it in water and freeze it, then cut it while still frozen.... You could cut JUST the legs and stuff up if you don't want it to he nasty cause it could get gross if you cut up the body/head.