From Longman Dictionary of Contemporary Englishchipmunkchip‧munk /ˈtʃɪpmʌŋk/ noun [countable] 
HBAa small American animal similar to a squirrel with black lines on its fur
HBAa small American animal similar to a squirrel with black lines on its furExamples from the Corpus
chipmunk• Does that mean that a man is a better machine for running than a quail, or a chipmunk or mouse?• A chipmunk dashed across the grass.• She got to see a grizzly bear, skunks and chipmunks.• This animal escapes danger most like a. stonefish chipmunk cat 3.• That and the chipmunk are the only sounds in the forest.• Letter 9 I get out your photo with the chipmunk face and kiss it.• This animal moves most like a. turtle chipmunk robin 2.• It's the one where you've got your chipmunk face on.Origin chipmunk (1800-1900) Ojibwa 