Gemmy Industries is introducing a toy replica of “Frankie the Fish,” the mechanical singing fish that starred in McDonald’s now-famous filet-o-fish sandwich TV commercial. The commercial, created by Arnold Worldwide in Boston, appeared last February for four weeks and featured the “quirky” song “Gimme Back That Filet-O-Fish.” Gemmy’s Frankie The Fish version will include motion-activated movements, the original version of the song, as well as a new club remix. The product is available at Kmart, Walgreens, CVS, Rite Aid, Bed Bath & Beyond, BJ’s Warehouse Clubs, Menards, and many online retailers.