Braid is the best choice for frog fishing- braid will float, has no stretch, and can handle HEAVY cover...
Fluoro VS. Mono....
Although fluoro has less stretch, the line will sink, making it harder to work the frog and more importantly to set the hook on the fish. Whereas mono will float and you can work the frog well, mono does stretch though, so you gotta make sure that frog get INHALED then you can wack 'em... If you are going to throw mono I would go with 15 or 17lbs...
Sometimes you just gotta work with what you got... Hope this helped