These little dudes are called Spriggans!
Spriggans are mischievous little plant faeries born from seeds!
They mimic the physical features of the very first animal the come in contact with (to varying degrees of believably). While they all share very similar body proportions, no two Spriggans are exactly alike!

The last two (as well as two others designed by Sean) are available for adoption over here!:

http://www.furaffinity.net/full/16531334/