Do you have the originals? If so, then it's Nyorotchi. Ahh, a true confirmation of a bad owner (or someone who really likes snake/duck hybrids...your pick)...My friend said she was cruel to her tamagotchis and got a Nyorotchi all the time. I don't have the originals, but I kinda like the little guy, despite all the problems he has.
So...yeah, by the looks of it, you weren't trying to get Nyorotchi, so...better luck next time.
...If you don't have the originals, though, then forget what I just said.
He is related to Tarakotchi,I had one last week.I got it by looking after it really well but NEVER turning off the light. He goes to bed at 10,wakes up at 8,takes a bath at half 8. When he runs up to the screen he is so cute!