I'm just wondering if anyone has attempted to use a soft plastic frog, like the Z man hard leg frog, on a C-rig.  And if so, did you have any luck.

I haven't personally, but I do know for sure that there are no rules in what you can put on a carolina rig, or any rig for that matter. Give it a try!

Im thinking of putting some on the line, i feel like the vibration of the frog would work well under water.

Flipping a Horny Toad with a pegged weight used to be a big thing (probably still is in some areas). It's not really a lot different than the action of a say a Rage Craw or Speed Craw, just a much bulkier body. 

Considering I've put a jointed crank on a c-rig, you're good to go.  I'd probably lean noisy flapper tho

I've seen a toad on a split shot be the top producing bait of a given day before so I see no reason why it wouldn't work.

Thanks for the input