Answer:
Looks like a hippo crossed with a unicorn.
It can be in a hat, Or out of the bag. If you see it you'll be smitten, 'Cause it's fluffy like a mitten.
The strangest creature you'll ever find: Two eyes in front and many more behind.
I waddle when I walk and swim in cold water. I wear a tuxedo all year round. What am I?
It can be white or blue or black, Humped or have a horn. And when it talks it sings its menuets, as it's travelling the depths.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.