Yes. Where I'm from, androids come in all shapes and sizes, though most are designed to be humanoid in appearance. Perhaps the most notable is an android that is nearly indistinguishable from humans in appearance and behavior that endeavors to become more human.
Yes on both accounts, however the need to "pass" for human is unnecessary in a society comprised of hundreds of varying species.
Whether or not the afore mentioned notable android was considered to be a sentient being vs an artificial lifeform incapable of independent, self-aware thought was once a subject of heated debate. A debate which I am happy to say ended in his favor.
text | un: janeway