No, probably not. If your thesis is: toy companies perform worse than the rest of the market. Then you would need to short toy companies and long the rest of the market. You would want to construct it to be market neutral: the same proportion of stock is held both long and short.

Just shorting toy companies would not work. Or it might work over some short period of time, but it's not the sort of portfolio you would want to construct for the long haul.