Alas, there is no pattern. I just started the shell with 30 stitches and reduced it two less stitches and one less row every color change. Then I sewed up the seam and stuffed it a little and coiled it and tacked it together.
Then, with the green I picked up the stitches on the inside of the shell rim, knit a row or two even, then started increasing. Did some short row stuff for the head, added some extra rows for the tail, crocheted then attached the antenna/eyes. Crocheted a base, sewed most of it on, finished stuffing and viola! A Snail!
Maybe I should sit down and write a pattern. Maybe. But it was really pretty easy.