Sea Eater.  I didn't see any free Sea Eaters and my kid wanted me to print one.  So I "crafted" these.  Think you can do better?  Well you're probably right.  Suggest printing face (? mouth?) down for all the supports on the teeth. 

I have two versions.  One has teeth and is a challenge to print (pictured) but it is pretty gnarly looking.  The second is easier and faster to print, however the lack of teeth detracts from the aesthetic.