Robot Chicken is the mascot from the show Robot Chicken.
This figure is from a two-pack that includes a 6″ figure of The Mad Scientist and this roughly 3.5″ figure of the Robot Chicken. The set was part of a very small 1:12 scale line made by Jazwares back in about 2010ish. I picked the set up at a Toys R Us.
Check the Archive for more figures:
This set occasionally shows up on Ebay so keep an eye out for that one. There is also a similar figure made by Kid Robot which will be in a later DotD. I also have the Mad Scientist in my box of stuff to sell.