Yes Frida and David helped Johanna get her daughter Hilda back by going to the troll world in a movie special
How will they going to get into the stone forest?
The same way they got out perhaps... More than likely Hilda WILL be changed back.
No spoilers in hand...dunno how to say this...but here it is: "The Mountain King."
That hasn't been confirmed yet, but Trundle will more than likely come into play in the movie.
I know that it isn't confirmed yet, but hey it's most likely.
Maybe frida can use a transportation spell to get into the stone forest to find hilda
Step 1: Get in via Nowhere Space
Step 2: Find her
Step 3: Bring Hilda to Johanna and Baba to Baba's mum.
Step 4: Realise that Hilda got Trundle out of his cave
Will frida use transformation spell to change Hilda back into a human?
What do you think?