Pac-Man frogs are sit-and-wait predators. They spend the majority of their time burrowed into the substrate with their eyes (and horns in some species) above the substrate. Because of this, caging does not need be spacious. Babies can be kept in small, plastic reptile enclosures, whereas adults can be caged in enclosures of 10 to 20 gallons.Pac-Man frogs love to burrow. Therefore they require a substrate that they can dig in to. Coir (ground coconut) makes a great substrate and is available at most pet stores. This substrate should remain damp, but not soaking wet.
Many people recommend keeping a water bowl in with the Pac-Man frog. I have kept Pac-Mans with and without water bowls. As long as you keep the substrate moist, a water bowl isn’t a necessity.
Pac-Man frogs will also use hiding spots, so they should be provided. Live plants, such as Pothos, not only provide hiding spots but also help to process feces and CO2. If you are using live plants, Josh's Frogs recommends keeping them in the pots, to make the plants easier to remove when you change the substrate.