As Jack said in an old up-date, Tingle was seen with a cobra on his back. Now this is what ive uncovered. On the back of Link's pajamas, he has a picture of a lobster. Not only that, but the potion guy on Windfall has a wasp on the back of his lab-coat! What do you guys think about this?
Now then, to reiterate what I already said. I wouldn't look too deep into it. It probably doesn't mean anything. Plus, if you're going to try and use the cobra as evidence that Tingle is evil, what if Link had the cobra on his shirt? Would he be evil, then?
Maybe animals are sacred to the people in TWW. i dont know. Either that, or it was put in the game to make the clothes look cool.