Weird... How many ponds do you have out? I always keep around a lot of ponds just for these occasions and can say if I just clicked on 4 or 5 in a row I always got a shipwrecked troll(I usually clicked on 10 or so). These trolls were much easier to find than the monsters from the recent hunt... Also do not forget you get the "free" one by opening the fools chest you were given.