cave druid and fog ooze

[Rogar Stonebow]

Do your attacks do negative energy damage?

[Rogar Stonebow]

If they do, do those attacks heal undead?

[Captian Von Spicy Wiener]

Cave druid can only wildshape into a large creature. Hungry fog is a huge creature. However if your DM is allowing you to wildshape into huge creatures then yes, you gain the creatures natural attacks(meaning they do deal neg enrgy damage). Anything that deals negative energy damage will heal the undead, so once again yes you can heal undead. however this is only if your DM is allowing you to wildshape into this creature.

[Drackhyo]

Polymorph subschool rule text wrote:

In addition to these benefits, you gain any of the natural attacks of the base creature, including proficiency in those attacks. These attacks are based on your base attack bonus, modified by your Strength or Dexterity as appropriate, and use your Strength modifier for determining damage bonuses.

I would assume the answer is yes to both questions.

[Rogar Stonebow]

Ok. I thought i can turn into huge ones. Thank you for the help.

[James Risner]

You only get Small, Medium, Large Ooze.

You get all the natural attacks but non of the Sp or Su abilities. If a natural attack is listed as Sp/Su, then you will see table variance on whether or not you get that effect from that natural weapon. Most will say no.

Example: wrote:

Melee +5 touch light ray 4d4

Light Ray (Su) The eyes glow with a bright red light and deal 4d4 damage.

In this example, you would have a +5 touch attack that deals no damage. Or deals 4d4 depending on table variance on whether or not you get the supernatural ability because it is tied to a natural weapon or you don't get it because it is tied to a Supernatural ability you don't get.