I have been trying to find a chorus of Wood Frogs for Whip to record for years and every time I think I"ve located one it turns out on closer investigation to be Leopards,I"ve located several good places for Green Treefrogs.Still looking for a Pickerel spot.I don't think they liken Cumberland county
Pickerel frogs are supposed to range statewide, but I have never found them on outer coastal plains soils. In Burlington County I have found them on the inner coastal plain, but not the outer. Here in Mercer County, and North, the juveniles like to overwinter in springs. I've never seen the adults in winter. Pickerel frogs will call from underwater, and their calls are a low-frequency 'snoring' sound.
For wood frogs, if there is doubt as to what you are hearing, I would say that looking at the time of year helps. Wood frogs will be the first calling, along with peepers and other chorus frogs. If you are hearing them on the first warm rains in March, they are wood frogs. You will also hear wood frogs calling during the day during the breeding season. They are explosive breeders, so their season is short.
I have reliable spots to record both species. You and Whip just say the word and we're there.