 Other names are putt-putt boat, crazy boat, flash-steamer, hot-air-boat, pulsating water engine boat.Around the world they may be called Can-Can-boot, Knatterboot, toc-toc, Puf-Puf boat, Poof Poof craft, Phut-Phut, or Pouet-Pouet.Commercial pop pop boats have usually been made out of tinplate.