They are not considered androids, because they are not in anyway robotic or artificial lifeforms, they are actual living beings with feelings and emotions. But at the same time, they are not natural. They walk and move similar to the way Zombies do except unlike Zombies, who just mindlessly walk around killing people, Frankenstein monsters actually are conscious as to what is going on, and in most cases, they have free will, and can choose whether to do bad or good.