Trail mix is a popular snack made of a combination of dried fruits, nuts, and other ingredients. It is often eaten while hiking or camping as it is a convenient and nutritious snack. The two crossword solutions for the term trail mix are HERD (4 letters) and GORP (4 letters). HERD is an acronym for 'Healthy Edible Ready-to-Eat Dried' and is used to describe the type of ingredients found in trail mix. GORP is an acronym for 'Good Old Raisins and Peanuts' and is another name for trail mix.