All the five internal organs have yin and yang. When we say the five internal organs are yin, we mean the dirty body, which is yin-shaped. Yang of the five internal organs refers to the function of the five internal organs, that is, function, and the function of the five internal organs is called Yang.
Simply put, as long as it is a visible organ, there are yin and yang, but yin and yang are different.
It's really nice of you to think so far. Medical books are rather vague. Many old Chinese doctors have never recognized stomach yang, lung yang and spleen yin all their lives. The treatment can be imagined!