Hello Lima!! It's nice to see you here! It's called "goi con" in Vietnamese but it's not a Thai thing. I think besides Bahn Mi, these summer rolls is their next national dish in Vietnam. The fact that it's called summer rolls in english because they are not fried like spring rolls and the rice paper skin is very light. It's perfect for summer snack because they have a lot of fresh herbs in it :D Guess, it's time for you to make some at home too?