They do not. They cannot. Documented vessels are legally unable to have titles. However, they do hold Certificates of Documentation instead. USCG documentation is federal law, and as such, it supersedes any and all State registration.
US Coast Guard Documentation Explained
Vessels that must be documented include those that meet the above standards and are used for commercial fishing activities on the navigable waters of the United States or in the EEZ (Exclusive Economic Zone). Additionally, vessels that engage in coastwise trade (transporting people and/or merchandise) on those same waters also must be documented.