No, African dwarf frogs don’t need land. Despite being amphibians, African dwarf frogs are fully aquatic. They live their entire lives underwater. In fact, if African dwarf frogs are out of the water for more than 10 minutes, they get extremely dehydrated and eventually die.
To keep African dwarf frogs happy, just ensure they can come to the water’s surface to breathe every once in a while.
Also, African dwarf frogs love jumping out of the water. And if they don’t fall back into the water, they might die, so to keep them safe, keep their tank covered with no openings.