Godzilla and King Kong surely weren't born big. They began small and grew over time to their gargantuan sizes even if the movies don't tell their childhood stories.Likewise, huge companies of today were once much smaller (unless perhaps they were spin-offs). Investors who spotted them early had opportunities to make fortunes.Can you still find such monsters in the making? Three Motley Fool contributors think so. Here's why they think biotech stocks CRISPR Therapeutics (CRSP 3.44%), Summit Therapeutics (SMMT ...