Squidward Tentacles only has six tentacles.
Squids have six tentacles.
Squid, like cuttlefish, have eight arms arranged in pairs and two, usually longer, tentacles.
So they technically have just two tentacles. But all in all, 10 remotely tentacle-shaped appendages.
Yeah, and I suppose Patrick Star should be renamed "Patrick Decagon" or "Patrick Pink Shape That Is Round And Has No Actual Real Defined Points So We Will Just Call Him A Star Because That Is What He Mostly Resembles".