Question: What American actress, singer, and songwriter stars alongside Josh Gad, Kristen Bell, and Jonathan Groff in what upcoming 2017 American 3D computer-animated holiday-themed musical fantasy featurette short film?
Sentence (from "Olaf's Frozen Adventure"): The film features the voices of Josh Gad, Kristen Bell, Idina Menzel, and Jonathan Groff reprising their roles from the original 2013 film, "Frozen".
Relevant evidence: Yes