grentree.au Green Tree Frog (Litoria Caerulea)

redeye.au Red Eye Tree Frog (H.Chlonis)

Sthbull.au Southern Bull Frog (L.D. insularis)

Courtesy MurrayLittlejohn, Department of Zoology, University of Melbourne © 
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Rana_clamitans.au Green Frog (Rana clamitans) (from Animal Diversity Web.) 

Rana_virgatipes.au Carpenter Frog (Rana Virgatipes) (from Animal Diversity Web.) 
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whites1.wav White's Treefrog
whites2.wav White's Treefrog:

greentree2.wav
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bunchofrogsounds.aiff  Red Eyes 
from <A HREF="http://www.discovery.com/DCO/doc/1012/world/nature/frog/treefrogs1.1.html">Discover Channel</A> page 
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bullfrog.wav Bullfrog (Rana catesbeiana)
peeper.wav Spring Peeper (Pseudacris crucifer)
wood.wav Wood Frog (Rana sylvatica)
fowler.wav Fowler’s toad (Bufo woodhousei fowleri)
graycricket.wav Eastern Gray Treefrog (Hyla versicolor)

above files from
<A HREF="http://dnr.state.il.us/frog/">Illinois Frog and Toad Facts</A>