“Frankly, my dear, I don’t give a damn” is the famous final line in the movie Gone with the Wind (1939) that Rhett Butler said to Scarlett O’Hara. “Frankly Scallop, I don;t give a clam” is a T-shirt and bumper sticker saying that has been popular at coastal cities and seafood restaurants. “Frankly, scallop, I don’t give a clam” has been cited in print since at least 1984.
 
   
IMDb (The Internet Movie Database)
Gone with the Wind (1939)
Quotes
Scarlett: Rhett, Rhett… Rhett, if you go, where shall I go? What shall I do?
Rhett Butler: Frankly, my dear, I don’t give a damn.
   
8 April 1984, Detroit (MI) Free Press, record reviews, pg. 5F, col. 1:
Writers in Disguise—Pinkard & Bowden (Warner): (...) As for sustained absurdity, it’s hard to match “I Lobster But Never Flounder,” a fishy-sounding love song that concludes, “Frankly, scallop, I don’t give a clam.”
 
Google Books
Water Escapes:
Great Waterside Vacation Spots in the Northeast
By Nancy Woodworth
West Hartford, CT: Wood Pond Press
1987
Pg. 163:
That’s when we’d don the T-shirt we found in one of the Newport shops: “Frankly, Scallop, I don’t give a clam.”
       
24 November 1988, The Arizona Republic (Phoenix, AZ), “Resort seems uneasy as retreat; Rumors flying among Bush’s Maine neighbors” by Drew Jubera (Cox News Service), pg. A2, col. 2:
Out front, bumper stickers read, “I brake for lobsters,” and “Frankly, Scallop, I don’t give a clam.”
 
Google Books
Seafood Leader
1989
Pg. 146:
Shells adds a few “beachy” touches to each store such as nets, crab pots, “chowderhead graffiti” (plaques that read “Shrimp Happens,” “Frankly scallop, I don’t give a clam”).
 
Google Books
Painted Lady
By Maura Seger
New York, NY: Silhouette Books
1990
Pg. 18:
She’d checked out the shops but figured she could live without a plastic coffee cup emblazoned with a lobster, or a T-shirt that said, “Frankly scallop, I don’t give a clam.”
 
Google Books
A Deadly Vineyard Holiday:
Martha’s Vineyard Mystery #8
By Philip R. Craig
New York, NY: Scribner
1997
Pg. ?:
I went into the house, changed into shorts and my T-shirt that said FRANKLY, SCALLOP, I DON’T GIVE A CLAM on the front, and found the roll of film I’d taken out of Burt Phillips’s camera.
 
Google Books
Dr. Speedy’s Jokes and Riddles
By Higino Gonzalez
Lincoln, NE: iUniverse.com, Inc.
2000
Pg. 71:
“Frankly, Scallop, I Don’t Give a Clam”—seen on Cape Cod
 
Twitter
McKinley Jones
‏@mckinleyyyyj
Just saw a sign at a seafood restaurant that says “frankly, scallop, I don’t give a clam” and I shouldn’t be laughing this hard but I am.
6:49 PM - 10 Jul 2016
St Simons, GA