In my opinion, yes. Some alien races have peculiar-shaped heads.
In my opinion, yes. Some alien races have peculiar appearances, except for some that are externally indistinguishable from humans and animals. But for now, it is unknown.
If aliens exist there could be some alien races that have reptavian characteristics.
If aliens exist, the alien races may have mammavian characteristics.
If alien races do exist, they could possibly have hermaphrodite characteristics.
Alien races could possibly have elf characteristics if they do exist.
If aliens exist, some alien races could possibly have equine characteristics.
If aliens exist, some alien races could possibly have ursine characteristics.
If aliens exist, some alien races could possibly have caprine characteristics.
If aliens exist, some alien races could possibly have porcine characteristics.
Some alien races could have mineral based characteristics, if they exist.
There is no proof that aliens exist. If they do, it is possible that alien races could have insectile characteristics.