Calling frogs signal the change of season By Ned Rozell [fusion_dropcap]N[/fusion_dropcap]EAR BALLAINE LAKE — Over the blat of engines and hum of tires on nearby Farmers Loop, Mark Spangler hears the chuckles of the animal he is studying. Male wood frogs in a one-acre pond on the campus of the University of Alaska Fairbanks are [...]