No. They have their own crawler but it's only used for Instant Answers and other widget stuff.
https://duck.co/help/results/sources
> In fact, DuckDuckGo gets its results from over four hundred sources. These include hundreds of vertical sources delivering niche Instant Answers, DuckDuckBot (our crawler) and crowd-sourced sites (like Wikipedia, stored in our answer indexes). We also of course have more traditional links in the search results, which we also source from a variety of partners, including Oath (formerly Yahoo) and Bing.
So in other words, all organic search results come from Bing and Oath.
EDIT: This is an honest question, not snark. I'd appreciate an honest answer instead of a blind drive-by downvote. I don't learn anything about why a thin UI layer over a bunch of search engines I can access directly is useful for privacy if you just downvote my comment.
Surely DuckDuckGo has implemented their own search engine, crawler and indexer apart from other providers?