I'm afraid you will discover on this site it is NEVER recommended to mix species of frogs... if you can find care sheets for both you will likely discover they need different temps, humidity, living requirements. Also many frogs give off toxins that are toxic to other species but there own. Co habitation can also increase stress levels which is always bad. Then there's the size issue... Larger frogs will try and eat smaller ones, so death or impacting, choking can occur if they are not very similar in size.