The term SNACK WITH A SHELL can be solved with the 4-letter word TACO. Tacos are a popular Mexican dish consisting of a corn or wheat tortilla filled with various ingredients such as meat, cheese, beans, lettuce, tomatoes, and salsa. They are usually served with a crunchy shell made from fried corn or wheat. Tacos are a popular snack food around the world, and are often served as street food.