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The actor will also serve as a producer on the hybrid CG/live-action movie, according to Deadline.
Having played the fearsome warrior Khal Drogo in Game of Thrones and more recently superhero Aquaman, it follows naturally that the 40-year-old now steps into the shoes of, errr, a big frosty snowman.
As Jon Berg - one of the producers on the film, who worked with Momoa on Aquaman - put it: "From his role as a fearsome count in a land of ice and fire to the oceanic success we all had with Aquaman, it felt only right to realise Jason this time out of snow."
Jason Snowmoa? ... Or maybe, Jason Mosnowa? Hmmm, I'm gonna leave it.
Greg Silverman, who will also produce on the movie, expanded a bit on the rationale behind the casting.
He said: "We know Jason as a true human being filled with love, compassion and a deep connection to ohana - all of which is the living spirit of Xmas and Frosty."
'Ohana' is a Hawaiian term meaning 'family', something the actor holds close to heart, as his most recent Instagram post a few days ago demonstrates:
As with basically all things film and TV related at the moment, we have no idea when we can expect to see the re-imagining of the famous snowman, so we'll just have to wait and see.
Frosty the Snowman was first conceived back in 1950, in the famous Christmas song written by Walter Rollins and Steve Nelson and recorded by Gene Autry and the Cass County Boys; though it was subsequently covered by the likes of Jimmy Durante, Nat King Cole and Guy Lombardo.
The tune proved to be a huge hit and was subsequently adapted into an animated TV special in 1969 and several subsequent international sequels.
Little did Rollins and Nelson know when they penned the ditty that it would become the basis of a 21st Century post-pandemic hybrid CG/live-action movie starring the voice of Jason Momoa.
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