Well it sounded more like what was mentioned, a squeaky, higher pitched, weaker call than what Verde usually belts out. The night before I could have sworn I woke to two frogs calling (I selectively will wake up if I hear a call, but will sleep through a house falling around me ), so this seemed to confirm that Boom is beginning to call and show signs of him being male. Which would be great, I could have another set of males, just like my old ones.