Robinhood Markets' commission-free trading platform has made buying stocks easily accessible and helped push retail-investor participation to record levels. While Robinhood traders more frequently make the news for helping to power short squeezes or getting behind the latest meme stocks, users of the platform have also put their stock-purchasing power behind some less risky but still promising growth plays. Read on for a look at two great stocks favored by Robinhood investors that are worth buying this month.