Forest Trolls and Poison

[Zombulian]

Forest Trolls (MMIII) have an interesting (ex) Special Attack. They have a poison that they apparently make from their saliva and can use to coat their weapons and claws. The poison clearly has a step between being saliva and an actual poison, because their bite attack doesn’t have the poison.
For a DM, this isn’t a huge deal, you just assume that they pre-poisoned their weapon and run the encounter.
For a PC trying to use a Forest Troll as a Polymorph form however, it’s a bit more confusing.
How would you guys handle it? The poison is listed under their Special Attacks, so Polymorph should give it to you, but also there are no explicit rules on converting their saliva to said poison.

Bonus Question: If a PC can make the troll poison and apply it to weapons, would it last longer than the duration of the polymorph form? Could you apply the poison to your party’s weapons in the morning while in troll form and then they have it until they hit with that weapon?

[denthor]

Do you want your players to have access to the poison?

Only of the answer is yes does this apply. You can state it does not become poison immediately. It take exposure to air for a certain length of time. Thing about humans we put fingers pens pencils chew on them. If our saliva was poisonous we would be immune but other things would not be. The troll may not know about it. They are not normally bright.

Or they eat something that causes it to happen constitution means it does not affect them but may kill other creatures. So polymorph then eat it if you dare.

[Falontani]

Troll sweat + spit + poop for the poison! Obviously not raw

[Mr Adventurer]

Could be a time and concentration factor, like, Forest Trolls spend a lot of their time licking their weapons and it's only as the saliva collects and congeals over time that it becomes the poison. So it would apply if you were polymorphed long enough and really committed to it.

Is the poison as it applies to their attacks the special ability, or is the power to make the poison the special ability?