All the soft rubber top water frog lures my three fishing buddies, at least two of them do, and the one I picked up cheap($1) at a fishing flea market have the double hooks. I just checked on line and the used one I brought for $1, goes for $11.99 on line.
Why the double hooks, besides all the lures look that way. The weight of the hook. I'm not sure it would float hook point up with a single hook. Might if I tied in the legs lower on the body. I have couple extra bodies made up. When I finish tying up the other four. I'll tie one up with a single hook and see what happens.