It is what sawyers call an upset swage or hammer swage. It is a variation on the swages used for circular saws In this image the top two are for circular saws and the bottom one is for crosscut.
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A "saw set" OTOH is used to bend saw teeth. Usually every other tooth is bent in the opposite direction this is done to create kerf clearance.
A upset swage is a forging tool that forms the tooth metal back to its original shape by hammer blows. There are also lever type swages where one uses a hand crank to shape the tooth.
Here is a good explanation for swaging a circular rip saw.
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