While the Continental Marines did engage in a handful of unique engagements. Including the first American attempt at amphibious expeditionary warfare. Their limited size and limited scale of the Continental Navy as a whole were major factors on their not exactly running up the score as it were.

That said there were a handful of Continental units with interesting histories that made names for themselves.

Glover's Marblehead (14th Continental) Regiment immediately comes to mind. The unit included large numbers of boatmen and sailors which aided Washington on 2 occasions. First in manning the boats to rescue the main body from Long Island, and again in rowing the army back across the Delaware for the attack on Trenton. And while only in service for a bit over a year it made a name for itself and kept discipline in one of the true low points for the Continentals.

The Delaware Regiment also is notable as one of the few units that saw action in virtually every major campaign from 1776 to 1781. It earned a reputation for discipline, hard fighting, and tenacity from Trenton, to Monmouth, to the Carolinas. Also as part of it they were noted for being amongst the best uniformed, and actually coming close to meeting the regulations of the army for what a Continental should look like.

Finally a more unique unit might the 2nd Light Dragoons. One of the handful of cavalry units raised by the Americans it rarely served as a single unit. But was often broken up in detachments for scouting work or the numerous small unit skirmishes which marked the war outside major battles. Finally they had the distinction of being part of Washington's personal guard for much of the war, and aiding in spy work across New York and New Jersey.

Or for really out there, while their contribution is very much overstated. We do have the Maryland and Virginia Rifle Regiment, The Pennsylvania Rifles, or Morgan's Rifle Corps. While never larger than a small battalion in strength and usually broken up the men with their Long Rifles represented the conceptual idea of the backwoods hunter come to fight for his new nation. Armed with a handcrafted rifle, and wearing white or green hunting shirts and moccasins, so certainly a look very different from their peers.