You searched for: “phagotroph”
phagotroph (s) (noun), phagotrophs (pl)
An organism that obtains nutrients through the ingestion of solid organic matter: The phagotrophs include all animals from the simplest, single-celled animal (for example, the protozoa) to the higher life forms. Phagotrophs have some type of device to ingest particles, a digestive system, and a system to discard waste products.

Phagotroph is the opposite of "osmotroph".

phagotrophic, phagotroph, phagotrophy
1. Feeding by ingesting organic particulate matter.
2. A reference to cells in the blood or body fluid that ingest foreign particles.