without seeing the movie trailer itself, cause i can't search it up, i can only speculate. there's plenty of post processing shaders that can achieve similar, or could even be some kind of ai nowadays
“Klaus,” Netflix’s first animated film, is an origin story of Santa Claus. Because the Oscar-nominated movie appeals to nostalgia, director Sergio Pablos and his team at The SPA Studios in Madrid decided to make the film in 2D. But they also wanted to advance the look, so they developed new technology that adds details like lighting and texture ...
when picking a name i just think of something, do a quick search to make sure the top result isn't something massive or has negative connotations and then go for it