There's a way to search this on Baseball-Reference. But it says: "Subscribe to Stathead Baseball for full results." It's $8 per month. Here's the page where I began using WHIP and platoon splits (but I don't subscribe, so it only gave partial results). And, I'm not sure if I applied the search criteria correctly, it's kinda confusing:
https://stathead.com/baseball/split_fin ... onMatch=isAlso says:
NEW: Sample Searches for learning more about the power and flexibility of Stathead. • Game data is only available for the American League, National League, and Federal League. Data runs from 1901 to present for regular season data, 1933-Present for the All-Star Game, and 1903-Present for the Postseason. Please see our data coverage page for details.