[Calahan]

I have no idea of the specifics of this game or the situation, but I haven't seen anyone mention the Sea King's Court spell yet. Which for 55W gets you 15 Sea Trolls, 5 Troll Guards, and a W3 Sea King. So if someone has a big load of Sea Trolls, then it's more likely they came from this spell and not from multiple casting of the "Summon Sea Troll" spell.

Also please keep in mind that the intel reports you get from Scouts and from bordering provinces can under/over estimate troop numbers by between around 50%-200% (although please don't quote me on those exact figures as it's from my memory rather than notes, but I'm pretty certain those figures are in the right ballpark). So if such a report is saying "~100 See Trolls" then there might only be ~50 there.