They call them “Mystery ?” caches.
The posted coordinates of a Mystery Cache may be any one of these:
If the posted coordinates are not for the final stage, the final coordinates must be added as an additional waypoint. The final stage cannot be more than 2 miles (3.2 kilometers) from the posted coordinates. This allows the cache to show up in nearby searches.
If the cache includes a projection, the projection may be calculated based on the posted coordinates without visiting the location.
Mystery Caches can have many different designs. The most common are:
Puzzle caches
The posted coordinates are usually bogus coordinates. Geocachers must solve a puzzle on the cache page to get the coordinates for the first stage or the final container. All clues needed to solve the puzzle must be on the cache page.
As for the title, it has nothing to do with any area cacher, really? Frogs, maybe
Frankly puzzles are my least favorite type, maybe because I find them hard.
So I made an easy one and you should have the coords in a zip
N40 22.ABC
W074 56.DEF
Axxxx xxBxx xxC-4xx XDxxx xExxx xxxxF
You can check your answers for this puzzle on GeoChecker.com.