I recently lost my form to a polymorph spell and I am a caster so I am trying to figure out what I have open to me. I am currently a squirrel.
Somatic components are vaguely defined in the rules:
A somatic component is a measured and precise movement of the hand. You must have at least one hand free to provide a somatic component.
The polymorph rules also are a little unclear:
While in such a form, you cannot cast any spells that require material components (unless you have the Eschew Materials or Natural Spell feat), and can only cast spells with somatic or verbal components if the form you choose has the capability to make such movements or speak, such as a dragon.
Does the form of a squirrel allow me to fulfill the somatic requirements for spell casting?
To help clarify this question, looking at the natural spell feat says something interesting.
You can complete the verbal and somatic components of spells while using wild shape. You substitute various noises and gestures for the normal verbal and somatic components of a spell.
Since thats the benefit of the feat, I guess the expectation is that normally you cant when wildshaping, which is based on beast shape, elemental body, and so on. All non-humanoid bodies.