I can't seem to find just the kitten heads in pattern form, but I would think you could take any stuffed knit animal pattern and adapt it to this.
Free Knitting Patterns useful selection of free patterns from the Knitting Wool Store
Free cat pattern Ravelry: Four knitted cats - tabby, ginger, black-and-white and moggy pattern by Kath Dalmeny
Pom pom Snowman Christmas Wreath by Daulhouseshop on Etsy Maybe not a wreath but cute idea for making snowmen
Over 50 Free Knitted Christmas Knitting Patterns ⋆ Knitting Bee
Charlie Bear, published in Let's Get Crafting issue 72 using Yeoman Yarns Crilly Baby DK