Had to say I'd never heard of it until last week.
Not sure what exactly this is, but it looks quite cute.The pattern is on Wikihow here http://www.wikihow.com/Crochet-an-Amigurumi-Toy
If you want to find more animals check out this website. There's lots of other stuff too here, snowman, frog, fish, jack -o- lantern or a skull bag for Halloween, even food like candy corn? There's also lots more crochet and knitting patterns on the site and lots of them are FREE!
This Blog has some unusual ones, jammy dodgers, strawberries, mushrooms and a bear dressed up as Little Red Riding Hood. Not all the patterns are given but it gives you some ideas. http://imaginarywardrobe.blogspot.com/search/label/amigurumi
Just in case you don't crochet but fancy giving it a try here's some instructions.