uncommon ce large giant troll 

Perception +18; darkvision

Languages Jotun

Skills Athletics +18, Intimidation +17

Str +6 Dex +1 Con +6 Int -2 Wis +4 Cha +3

Items club

Independent Brains Each of a two-headed troll's heads rolls their own initiative and has their own turn. Neither head can Delay. At the start of a head's turn, that head gets 2 actions and 1 reaction. Each brain controls one of the troll's arms, but both can move the legs. Any ability that would sever a two-headed troll's head (such as the vorpal weapon property) doesn't cause the two-headed troll to die if they still have their other head, but does cause them to lose the turns, actions, and reactions of the severed head. Mental effects that target a single creature affect only one of the troll's heads.

AC  24; Fort +20, Ref +15, Will +14

HP 190, regeneration 25 (deactivated by acid or fire); Weaknesses fire 10

Head Regrowth A two-headed troll's regeneration can regrow a severed head. After regaining Hit Points from regeneration, the two-headed troll attempts a DC 10 flat check. On a success, the missing head is fully restored. If a two-headed troll loses their last remaining head, they die immediately.

Attack of Opportunity [R]

Speed 30 feet

Melee [>] jaws +18 (reach 10 feet), Damage 2d12+8 piercing

Melee [>] claw +18 (agile, reach 10 feet), Damage 2d8+8 slashing

Melee [>] club +18 (reach 10 feet), Damage 2d6+8 bludgeoning

Ranged [>] club +13 (thrown 10 feet), Damage 2d6+8 bludgeoning

Reactive Chomp [>] Requirements One of the troll's heads hit the same enemy with two consecutive claw Strikes in the same round; Effect The other head uses their reaction to make a jaws Strike against the creature that was hit.

Bestiary 2, page 266.