Hot stocks may be showing signs of cooling down, given the recent correction in tech-laden growth stocks, and the boo birds are starting to chime in with their "told you so" chirps. Three stocks that have delivered monster gains -- Tesla (NASDAQ: TSLA), Momo (NASDAQ: MOMO), and Shopify (NYSE: SHOP) -- may seem vulnerable here. They're not cheap stocks, but the same thing could've been said when they were tagged as overvalued when they were trading at far lower prices.