Baby Shark Cookie Cutter. Two piece: stamp/plunger and cutter

thingiverse

Cut the dough with the perimeter cutter, then stamp the inside for details. Oil or dust both parts for best results. Designed to fit the main section of my kid's lunchbox. There are some parts of the stamp that are too thin or discontinuous, although it didn't affect the end result significantly. Not sure about the longevity though.