What is the frog's mood on the ground and why?
What are you studying? I envy your country baby and get in touch with nature. Frogs jumping on the ground have the same mood as you walking on the ground, and there will be happiness and sadness. They decide their mood according to what they encounter. As for why, because they are animals, they are flesh and blood. Your question is not clear enough, so the answer can only be this.