Apparently it's called a frogfish, and while it looks sort of cute from afar, this thing is ugly... and fascinating. DarkRoastedBlend has a whole gallery of different types of frogfish, from the fluffy to the warty.
Link via DarkRoastedBlend
Link via DarkRoastedBlend
And i would walk five hundred more
Just to be the man who walked a thousand miles
To fall down at your door"
That's what I was thinking about when I watched the clip!