I am both male and woman, I live where most living things couldn't, I always frown though my name suggest I shouldn't, What am I?

I have no lungs but I am alive. I need water to survive. I'm up and about night and day, I go with the flow, you might say.

I sizzle like bacon but I'm not in a pan I have a backbone but no legs or hand I shed my old skin to stay feeling new And I fit in a hole or slide through the dew

The king and a butterfly walk into a bar, and are immediately swarmed by fans. The barkeep asks what the deal was, and is told, 'do you live under a rock?! Don't you know a ANSWER when you see one?'

Encasing equipment and likely some feed. A bed for the foal to grow to the steed. When told your doors open, a warning to heed. A structure of red, near fields full of seed.