| General Dorsey |
Not unless the spell specifically states:
Polymorph: Unless otherwise noted, polymorph spells cannot be used to change into specific individuals. Although many of the fine details can be controlled, your appearance is always that of a generic member of that creature's type. Polymorph spells cannot be used to assume the form of a creature with a template or an advanced version of a creature.
There are some advanced and templated animals that you can change into, check out the sharks for some examples.