Frog question for you. My friend is a lead developer on the Minecraft mod terafirmacraft, which, among other things, makes Minecraft more realistic. It's got advanced crafting (pit kilns, forging, glass blowing, etc etc), accurate climates, a big diversity of tree and plant species, and most relevant to this ask, lots of animals. If you ever played Minecraft and said, "gosh I wish this was way more complicated but in a way that's much more interesting", this is for you.
But. The question. My friend is currently adding ambient frog noises to this mod. The big hurdle so far is finding creative-commons-licensed, reasonably good quality, accurate frog recordings. Do you have any resources in this vein? Also, he currently only has ONE Madagascar frog, which is not enough Madagascar frogs.