After a mother (Roxanne McKee) and son (Tom Mulheron) get in a car wreck, they soon become hunted by Bambi, a mutated grief-stricken deer on a deadly rampage seeking revenge for the death of his mother.
https://www.themoviedb.org/movie/1049942-bambi-the-reckoning
It’s got an Annihilation vibe going on that I kinda dig.