A Thoul is basically what happens if a Troll and a Ghoul like each other very much. - So, if you cannot get their child, choose one of the parents. :)
A Troll might make sense if you're emphasizing the wilderness/forest exploration of the scenario, a Ghoul might make sense if you want to emphasize the storyline concerning the undead. Personally, if I ran the adventure again, and had to make that choice, I would probably use a Troll.
The original version of the adventure, IIRC, had this Thoul be a creature infected by the Redwood Scar. So, the encounter was mainly designed to establish that connection; consequently, any Scarborn (?) creature might do if you want to dial down the power level. :)
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