This video shows you how to get the skull that is hidden in Bad Piggies Rise and Swine Level 2-10. The skull is located to the right of the starting point. Simply place Freckles on the ground with a boxing glove behind him.
If you have a different strategy for completing this level feel free to leave a comment below.
Another way to do it is to build a 4-bit wide cart, with suction cup wheels at the bottom. Use the V8 to bring the cart into the skull.