Drakeskull said:
Ok I would like to see how every one keeps there trolls dead and kills there trolls and the ways they can die.
Burn'em or drown'em. Acid is generally to expensive.
Can they die from death from massive damage?
Yes, if the damage is of a type they can't regenerate.
The way Regeneration works in 3.5 is that all damage is non-lethal damage, unless it's of a type they are vulnerable to.
So doing 50+ points of damage (in a single hit) to a troll using a normal club would not cause a Massive Damage check, as it's all non-lethal damage. You might knock unconcious for a few rounds until he regenerates, but it can't kill him.
If you do 50+ points of damage with a fireball, that counts as real damage to the troll, and can force a massive damage save.
Can you coup de grace them with out fire or acid?
No, it has to be an attack form they are vulnerable to (such as fire or acid).
Do you have to do that much accual fire or acid damage to keep them dead or do you allow them to simply after it is knocked unconsios cut there head off with a flaming sword?
Technically you have to do that much actual fire or acid damage, or have them fail the fort save from a Coup De Gras using a flaming or acidic weapon.
Cutting their head off with a flaming sword would fall under the Coup De Gras heading. It might take a few whacks to make sure (i.e. they might make the first fort save or two, since only the flaming damage would be used to calculate the save DC), but it's usually a foregone conclusion at that point.