Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a relationship.

Parasitism

Explanation:

This is because parasitism is a type of relationship that exist between organisms where one which is the predator feed on the prey thereby causing harm or injury or death to the prey. In the question, small frogs are the predators and insects are the prey, therefore the predators cause harm to the prey, meaning they only benefits from the farm they cause the prey.