Answer:
I am the noise Santa's reindeers make
The more it dries the wetter it gets. What is it?
I open to close but I close to open. I'm surrounded by water but I'm never soaking. What am I?
I come with a train and go with a train and the train doesn't need me but can't go without me.
I'm not a bird but I can fly through the sky. I'm not a river but I'm full of water.
I spend most of my day eating white. When I am quick enough I get rewarded with fruit and something blue. In a dark room with blue walls I run from the ghosts that roam the halls