Thanks for all the comments. I've actually added buttons, and it's so much cuter! As for the yarn, I used Soho Summer Jo Sharp DK Cotton. I wouldn't recommend it. It is INCREDIBLY splitty!! Quite frustrating to work with. I would probably make it in a nice DK weight superwash wool if I were to do it over again.
This guy that works for my husband was singing along to a George Thorogood (? I think) song, and one of the lines is "I gotta rattlesnake for a necktie". This guy thought it was "I gotta turtlesnake for a necktie". My husband thought that was pretty funny. Around that same time I made Sheldon the turtle for one of my friends, and he thought it would be funny if I made the same thing for this guy, but with a snake inside. Voila! Turtlesnake!