I think everyone here knows that I vote for the Force Fins. The Pro is an awesome choice for any style of kick. If you primarily frog kick though, the Pro IMO isn't the best thing about. The SD-1 Military, the Excellerator, and by far and away the Hockey Force are all better. In my testing, frog kicking a length in the pool, Hollis F-1 performed very well at 17-18 kicks, although the Hockey Force was 14-15. I did my best to match the times for each length, btw-I am not normally a frog kicker so a more proficient frog kicker may do better.
If you really want a more traditional paddle the Hollis F-1, IMHO is the single best Jet clone on the market.