I used to go frog gigging often about 50 years ago. "Catch"? Must be a local term. Unlike catching a fish you hunt them and the gig impales them, almost always causing death. We always went at night at ponds in the area. You use a flashlight to shine along the bank as the frogs eyes shine brightly when lit up.Really?
Choosing the right gig is crucial when going frogging as it can make or break your success rate. A gig is essentially a spear-like tool used for catching frogs in the water.
It could be that the accuracy of the person using the spear is more important than the perfect gig. If you miss them they usually dive in the water. I wasn't the best by far. Good times.
The only part of frog you eat is the legs.