Two images animated -> What is it called?

I’m looking for some kind of library where I can find a sequence of two images. I mean like the animated “The Clam” sign in Family Guy, or any neon-sign really. Where you switch between two images. Any idea what this type of animation is called, or where one can find such images?

You mean “GIF animation”??

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You can do this easily in GIF format with photoshop.