I've been doing some research into frog and human organ layouts, here are some findings:
Image scans from:
Gunther Von Hagens, Angelina Whalley, BODY WORLDS- The Original Exhibition of Real Human Bodies, Arts & Sciences, 2008
http://www.biographixmedia.com/biology/frog-anatomy.jpg
http://www.lookd.com/frogs/frog3.jpg
http://universe-review.ca/I10-82-frog.jpg
Visual Encyclopaedia of Animals, Dorling Kindersley, 2001