Can Crawlbot use a site map (or sitemap) as a crawling seed?

Yes, Crawlbot supports both sitemaps (sitemap.xml) or the gzipped equivalent (e.g. sitemap.xml.gz) as seed URLs. Crawlbot will pursue all links contained within the sitemap — including other sitemaps — in adherence to any crawl restrictions (patterns, regular expressions, hops or other constraints) that may be in place for your crawl.