Final answer:
The question lacks context about the 4th horror movie by Ben and Toothpick, making it impossible to provide an accurate answer without additional information.
Step-by-step explanation:
The question you've asked about the 4th horror movie that Ben and Toothpick were working on does not provide enough context for me to give a factual answer. This could potentially be a question related to a specific movie within a franchise or a part of a series of films or stories,
possibly discussed in a literature or film studies class. If this is a reference to a movie from a real film series, additional context such as the name of the series or its directors and producers would be needed to accurately identify the title of the 4th horror movie.
Without further details or clarification, I am unable to provide the exact name of the movie Ben and Toothpick are working on. If this is a question from a particular book, film, or study material, please provide more information so an accurate answer can be given.