Yes, that is a Perry the Platypus t-shirt. I have one because I am cool like dat. My sister is also cool like dat since she bought me the shirt. I don't know if it was a "I'm so sorry your hair turned out horrible" or just a thank you gift. Possibly both.
If you would like a Perry the Platypus t-shirt of your own you are going to need to check out the kids department. I believe mine is a boys large or x-large. It fits me well and I'm normally a woman's medium. This particular shirt was bought at Sears but I'm sure you could find some at most stores with Disney apparel. And then you can be cool like dat, with me.