What hooks do you guys use for a soft topwater frog such as a keitech noisy flapper or a Zoom horny toad? How do you rig these up. 

For the Zoom Horny Toad I like a 5/0 EWG t-rigged and skin hooked.

4/0 Frog Hooks.  Like this one

I have some and tried a few different hooks and settled on the 6/0 Owner Beast hook. The noisy flapper is pretty thick and the plastic is pretty hard. So, I think the 6/0 Beast was needed to get any sort of hook penetration. I will say I have not been able to fish this setup yet, so I can't say for sure.

When I tried out both a 5/0 ewg and a 5/0 flipping hook, I just didn't see enough hook penetrating the body to get into the fish. If the plastic were softer, a 5/0 might work. On Ribbit ftogs I use 5/0 as they are softer.

I have had some success with owner screw lock 5/0 hooks. The screw lock keeps from destroying the nose of the frog like a regular EWG 5/0 would. I can make one of these pricey frogs last 4 or 5 fish opposed to maybe 2 with a regular EWG hook. My only issue is that hook ups aren't great and I'd like to find a double hooked frog hook to try out. Any suggestions?