Buying top growth stocks while they are down can be a rewarding investment strategy. If a company is growing, investors can be confident the stock will eventually follow that progress.

If you have an extra $1,000 sitting around in cash, three Motley Fool contributors believe Toast (NYSE: TOST), Roku (NASDAQ: ROKU), and MercadoLibre (NASDAQ: MELI) have the makings of long-term winners. Here's why you might consider adding these promising candidates to your portfolio this month.

John Ballard (Toast): As  has proven in recent years, there is a massive growth opportunity in supplying cloud-based software to help businesses stay competitive in a digitized economy. Toast is following in Shopify's footsteps, providing an industry-specific platform for restaurants, and its recent growth suggests the stock could be a long-term winner.

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Source Fool.com