You could maybe try a larger hook and just skin hook the point on it kinda where the butt crack would be? or shove it all the way through and just barely skin hook it on top, the old Texposed method. The trouble is the sloping shape of the bait, makes skin hooking hard except in the rear of the toad, which is why I was thinking of using a bigger hook.
I take it they can be pretty effective on a C-rig? If your missing fish you must be getting bites!