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As for schnoz, it does sound Yiddish, there does exist a verb schneitzen ` to blow one's nose, 'and the shn - combination does connote something to do with the nose; but there is no word shnozzle in Yiddish, only noz or, in the alternate dialect, nuz.
A handy hint for those who don't have chipmunks nearby, but do have dogs: Your typical labrador retriever will happily stick his shnozzle in the jar and lick it clean in under 6 minutes!