First, you sit on a troll’s head at Midsummer, when even the stones come alive. If that sounds fantastical, you should really go to Iceland at Midsummer. You’ll see. In this way of the thrush, you get to hang out with a troll. Nice.
The other way of the thrush is to be the living thought of the troll, not in words or ideas, but in thrush. Nice, too!
Remember, trolls aren’t animate beings from fairytale, but places where rocks are made into home and mind through attachment. It could be you. It could be the thrush. It could be the thrush leading you into the Earth, where you find yourself.