For fish, beer or water. And then egg yolks, flour, cornstarch, and spices. Depends on what type of fish. But cod or the like. Light beer, lemon zest, tarragon, salt, white pepper, cayenne, garlic and onion powder.
For frog legs, and since you like jerk. Make a jerk tempura. Tonic water, soda water, or just cold water. And again flour, corn starch, egg yolks, and one of the many jerk recipes online but without the oil.