Hello again,
Sorry to bring up an old post but I wanted to say thank you for the help of the members here for their advice. The frog is fine, on our way to the vet I was able to remove the obstruction and her cloaca went right back in with minimal help from me. Good thing too because this vet really had no idea how to treat a frog anyway.
Again, thanks so much for your advice, you saved her life.
Mat.