Isn't there a Superman arc where his infant-self's ship crashes on Earth and then prompts his growth? Or something thereabouts.
I always thought it would be cool if Kryptonians looked alien, maybe even bipedal (so they weren't like 8' locusts), but Kal-El's ship, say, surveilled enough data about human physiology during its descent and altered his appearance to mimic humans (while retaining his Kryptonian nature). This would even further emphasize his alienation. (Ignore pun.)
nope. it is clearly shown in several origin sources that Kal-El's parents also looked human