SOPCHOPPY, Fla. — As professional grunters, Gary and Audrey Revell get up before sunrise and drive 25 miles over dirt roads deep into the heart of the Apalachicola National Forest to catch worms. As the sunlight barely pokes through the pine trees, they climb out of a Ford pickup truck adorned with a bumper sticker that reads "Welcome to the South. Now go home." Audrey hauls a sack filled with empty one-gallon buckets and Gary carries a 10-pound iron rod and a wooden stake. After hiking off the trail a short way, Gary slams the stake called a stob into...