And just as I was finding a parking space, saw...
Next I saw two red-shouldered hawks, and grabbed a shot of one flying in a kinda quarter view, which is pretty good for showing the ID marks for the hawk.
There is a good website on this species if you want more details at:
http://animaldiversity.ummz.umich.edu/accounts/Anax_junius/#reproduction
And finally, back to frogs. As previously noted, the wood frog is the first to breed in northern Virginia. Now, they are tadpoles, and the egg masses are just off-white blobs, as seen here...