Out of the Soylent Planet by Robert Kroese

Interstellar con man Rex Nihilo has a price tag on his head.

Railroaded into smuggling a shipment of contraband to a planet short on food, Rex finds himself on the run from an insidious corporation named Ubiqorp, which reaps obscene profits by keeping the planet dependent on shipments of synthetic rations. When Rex and his long-suffering robot companion Sasha are sentenced to work as slave labor on a massive Ubiqorp plantation, they learn the terrible secret behind the corporation’s products. Well, maybe not so much terrible as mildly unnerving.

To escape, Rex and Sasha team up with a mis-programmed combat drone and an intelligent mutant plant to lead a rebellion against their merciless corporate overlords.