I stumbled across this great Japanese site cataloging Japanese novelty toys from the Sixties, Seventies, and Eighties. Some favorites:
-Who needs "Love Plus" when you've got the Nintendo "Love Tester"?
-The "Tomboy" Slinky knock-off that suggests using it as a cigarette holder.
-Mini Robot... IT WALKS LIKE A HUMANBEING
The same site also includes an exhaustive list of plastic kaiju, yokai and ninja tchotchkes (I can't believe I spelled that right on the first try) sold at candy stores back in the day.