The term SQUIRREL FOOD is composed of three crossword solutions: ACORN (5 letters), ACORNS (6 letters), and NUT (3 letters). ACORNS and nuts are the primary food sources for squirrels, as they are high in fat and protein. ACORNS are the fruit of oak trees, while nuts are a type of hard-shelled seed. Both ACORNS and nuts are eaten by squirrels, either directly from the tree or after they have been stored away for later consumption.