Hi Brian:

Here is a link you may be interested in (it is downloadable): http://wildlife.state.co.us/SiteColl...vGapeWidth.pdf

I found another article:
Annual Growth Rates of Adult Gray Treefrogs (Hyla chrysoscelis)(pp. 382-385)
Journal of Herpetology > Vol. 25, No. 3, Sep., 1991
Mark E. Ritke, Jeffrey G. Babb, Mary K. Ritke