The Swamp of the Ravens
El pantano de los cuervos (original)
Dr. Frosta dumps body parts and corpses in the marsh, where they rise up again for vengeance.
Starring Ramiro Oliveros, Marcelle Bichette, Fernando Sancho, Antonia Mas, César Carmigniani, Gaspar Bacigallipi, Bill Harrison, Marcos Molina, Melba Centeno, Mónica Jurado
Watch "The Swamp of the Ravens" on Cultpix released in 1974. It's a science-fiction and horror movie, and has a rating of 3.5 out of 10 from Imdb which is fairly low for this kind of movie.