That's American style. Got a frog? Chop off 2 legs, chuck the rest. Got a fish? Fillet it throwing away the head, skeletion, belly meat, then skin the fillet so you've got a good 6 ounces of tasteless bland meat out of that 3 pound fish. Got beef/pork/lamb? Throw away everything that's not meat attached to bone. Got a Chinese mitten crab/gulf tiger shrimp/bighead carp/Florida snake/iguana infestation? Shoot 'em, and bury their bodies! Nothing's good to eat! Then redneck yourself on over to Walmart and spend your last $17 of the month on a microwave macaroni&cheese/hotdogs/pizza meal that's 90% fat and carbs.
Nah, that's rigor mortis. Frog was probably chilled in an ice tank killing it or they stabbed it through the head.