Typically precedes milk violently squirting out of your nose

I have a back and have some teeth, but I have no head. I only work when I am fed. What am I?

Some people might think that you're of your rocker if you call this game football instead of

One may rule a bustling hive, another keeps a realm alive. Though one has wings and one a throne, they share one royal name alone.

I wear a crown of seeds, a patty for my heart, Layers of green and red, a culinary work of art. Though I'm often held in hand, I’m a king in my own right.