What term describes the bandicoot's diet of invertebrates, roots, fungi, and fruit?

Opportunistic omnivores.

The diet of the bandicoot is highly varied and flexible, reflecting their ability to exploit whatever resources are available in their foraging grounds, particularly during their nocturnal activity periods. They consume a wide array of food items that span both animal and plant sources. This consumption includes invertebrates such as grubs, worms, beetles, and spiders, alongside various forms of plant matter like roots, tubers, seeds, berries, and fungi. Because their diet encompasses both animal protein and plant material, their feeding classification is accurately described as opportunistic omnivores, relying on their keen sense of smell to locate these hidden snacks in the dark.