Yes, African dwarf frogs need a heater. African dwarf frogs need warm temperatures of 75⁰F – 78⁰F ( 24⁰C – 26⁰C) to thrive.
Like other amphibians, African dwarf frogs are cold-blooded and thus, unable to regulate their own body temperatures. If their habitat’s temperature is too cold, the frogs’ metabolic processes might stop, causing organ failures and eventually, death.
Even if you place their tank in a warm area, the water temperature can still fluctuate throughout the day. If you want to keep your African dwarf frogs happy and healthy, you need to install a heater in their tank.