Here's a link which has a sample from the Seeger story.
http://www.artistdirect.com/nad/store/artist/album/0,,195040,00.html
I've always been a big fan of Beatrix Potter. If you like anthropomorphism it doesn't get any better than her wonderful illustrated characters.
I have a night table copy of Petris Cuniculus in Latin. It has Flopsa and Mopsa as well as Cauda Linea, Petris, as you'd expect in a Latin version.
"Nolite ire in hortum Domini MacGregor."
I'd forgotten Jeremy the Frog. I thought you'd all like Pete Seeger's frog since we got on this "ribbiting" subject.