All frogs are nocturnal, so will probably be more active after the sun sets. It looks to me, and sounds a lot like, the common American Bullfrog. I do not have a lot of experience with bronze frogs, but here is a link that might help distinguish between the two. Both are very interesting, but I would not recommend keeping them in captivity as they require large enclosures ( 100 gallon tank for 1 frog ) and are notoriously mean. Green Frog - North Carolina