Could it be The Wizard of Oz?

There is a scene where Dorothy goes through a forest that attacks her and her companions. The trees are actors inside elaborate costumes.

The final movie doesn't have this scene where they have a lot of singing and dancing involved (apparently the costumes didn't fare well with all the moving). The trees themselves still remained in the movie.

Could it be The Wizard of Oz?

There is a scene where Dorothy goes through a forest that attacks her and her companions. The trees are actors inside elaborate costumes.

The final movie doesn't have this scene where they have a lot of singing and dancing involved (apparently the costumes didn't fare well with all the moving). The trees themselves still remained in the movie.