Welcome to Frog Forum.
You have a Chadian Horned Frog(Ceratophrys Cranwelli) Lol! This way you know that they are one in the same
You've already been given good advice, but how often they poop is determined by a few factors. Correct climate conditions, Substrate moistness, his often they eat and how much, and the frogs overall metabolism. They do not always go much less frequently as they age, but most do. Every 3 to 5 days is the average so you're ok, but make sure he passes every stone or he may become impacted and die. Keep a close eye on him.
Nice Cranwelli.