As an academic I hope I'll be forgiven for offering an academic answer to what is, really, an academic question : "morph" and the various related English words come from the Greek word meaning form, or shape. Thus "amorphous" = formless, "polymorphic" = having many forms; "gray morph" = gray form. The question of whether "morphs" may correctly be applied to various forms of a living organism is not merely academic but purely academic, in that the answer is not grounded in some verifiable, external truth but is rather a product of consensus within the academy. There is no objectively right or wrong answer to questions like this; there is only usage. So lick your index finger, point it in the air, and see which way the wind is blowing.

Hal Opperman
Medina, WA
hal at catharus.net