Answer:
I am a nut with a hole
Part carbon, part water, I am poison to the fishes. Many falsely claim my name, I am the pause that refreshes. What am I?
Of the king I am blue and of the peasant I am red. Of the frog I am cold and of the dog I am hot instead.
I open to close but I close to open. I'm surrounded by water but I'm never soaking. What am I?
I give people a huge fright, but at the end I'm sweet. I normally celebrate at night, when there's less heat. What am I?
A darkΒ-colored creature serenaded by Lennon and McCartney.