Question: Which production company produced both Frosty the Snowman in 1969 and Frosty's Winter Wonderland in 1976?
Sentence (from "Frosty the Snowman (film)"): The program, which first aired on December 7, 1969 on CBS (where it still airs to this day), was produced for television by Rankin/Bass Productions and featured the voices of comedians Jimmy Durante as the film's narrator (Durante's final performance in a film) and Jackie Vernon as the title character.
Relevant evidence: Yes