Yes, there is a word to describe a person who always laughs: "chucklesome."
The term "chucklesome" refers to someone who frequently or easily laughs, often finding things amusing and reacting with laughter. It's used to describe individuals who have a cheerful and lighthearted disposition and tend to see humor in many situations. However, it's important to note that "chucklesome" is not a commonly used word and may not be familiar to everyone. In everyday conversation, you might simply describe such a person as "always laughing" or "someone with a great sense of humor."