青豆 covers two related foods: green peas (the small round ones in fried rice) and young/green soybeans, also known as
毛豆 (máodòu, edamame in the pod). Context disambiguates — in restaurants
青豆 typically means peas; on menus listing
毛豆 vs
青豆,
青豆 is the shelled green soybean.