Shape Change questions

[Tetujin]

Does the shape change ability (of the Doppleganger or Irda), when it says 'humanoid', it means the humanoid type in the creatures discription (which I assume), or simply humanoid in form (2 arms, 2 legs, etc). Also, is there such thing as a large humanoid? what about one with a fly speed?

 

[James McMurray]

It means the type.

I'm not sure about there being a large humanoid, but the Avariel from Forgotten Realms are winged elves.