In the box in the bottom left of page 10:
"When battling the Trogs in games with 2 or 3 players, the first player to the left of the player fighting against the Trogs controls the Trogs in Battle. This includes placing Trog Units on Battle Objectives and playing Tactics cards from their hand."
As written, in the most traditional sense, this dentotes that the Trogs have their own hand.
If it meant that cards come from the controlling player's hand, the rules should have said "... and playing Tactics cards from his or her hand".
However, it could be that the rules-writer just has a liberal attitude regarding formal grammar. (In my opinion, not the best choice for a rulebook!)