Question: who does the voice of the cloud in trolls
[{'answer': 'Walt Dohrn', 'provenance': [{'wikipedia_id': '37935799', 'title': 'Trolls (film)', 'start_paragraph_id': 1, 'start_character': 170, 'end_paragraph_id': 1, 'end_character': 180, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]