Well, for RPGs, I don't know of any. But there are the Redwall books by Brian Jacques which feature talking animals. Unfortunately, most of them are warm-blooded animals. Hares, otters, badgers, squirrels, mice, rats, Minks, and even cats. Also birds, snakes...
Its funny, I've known of Redwall for a long time, and despite it sounded like something that would be my jam, I've never actually taken a first hand look at it. I should fix that someday.
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https://en.wikipedia.org/wiki/Redwall
The artist is Astor Alexander. You can see the rest of his stuff here: https://www.behance.net/astoralexander