Yes, franks is a Scrabble word!

Verb

1. Stamp with a postmark to indicate date and time of mailing

2. Exempt by means of an official pass or letter, as from customs or other checks

Noun

1. A member of the ancient Germanic peoples who spread from the Rhine into the Roman Empire in the 4th century

2. A smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll