Fin
From Tardis Wiki, the free Doctor Who reference
The Fourth Doctor described the Pescatons as having "fins like claws." (AUDIO: Doctor Who and the Pescatons [+]Loading...["Doctor Who and the Pescatons (audio story)"])
The people of the underwater city of Vallarasee were nicknamed "Fins" by human tourists. (AUDIO: One Mile Down [+]Loading...["One Mile Down (audio story)"])
