>>40175775>>40175776>>40175787>>40175798Jellyfish can't move their tentacles and don't have long thin heads or fucking beaks under their bodies like octopi and squids do.
Even if it was apparently intended as a jellyfish, it objectively resembles a squid or octopus much more, hence it's American name. Squids also have two long extending tentacles like Tentacool.
If someone tries to draw a jellyfish but ends up drawing a squid, and the squid design is the one that gets used, then it's a squid.