Yesterday I switched their terrarium, it used to just be flat dirt with a bunch of twigs and a water dish and now they have a pond with a waterfall and proper bedding, moss etc: (sorry for the bad quality all I have is a camera phone)

They seem to like it a lot more, they used to spend most of their time up in the corners of the cage and now they seem to actually explore around the cage and sit in other places...
This morning my boyfriend woke up and said he heard "ribbits" from one of them... but I thought both of my frogs were girls, because they both have white throats. I looked in the cage and one of my frogs throats looked very strange, right under the jaw was flat and then further back on the throat, I'd call it the "neck" part haha... its very puffed up and round. Does this mean he is a she?? Is it normal for their necks to look like that?