Ew DC comicsCanonically, Santa exists in the DC universe. The fact Clark's parents had to buy and wrap presents for him instead of Santa, is that Clark was on the naughty list. Because he was a dick.
Even TurtlesView attachment 365570
I mean it's not unique or specific to mermaids, everything in the sea wants to kill you (starting with the sea itself) and feast on your flesh, mermaids are no exception.