It would seem yes, as dux or military leader of a jurisdiction. It should be noted that the title dux was a appellation of Latin Church writers of the time (our only sources) and so we don't have absolutely clarity as to the actual political formation of these titles (were they 'naturalized' or 'created'?); however, Frankish counts and dukes were more or less office appointments under the Merovingians and not yet heritable titles, and continued so under Carolingians.

Each Merovingian king extended his royal authority through the appointment of magistrates, ‘counts, domestics, mayors, guardians, and everyone else required for imposing royal control’. Officials serving at the royal courts included mayors of the palace, counts of the palace, counts of the stables and domestics, who might all also function as generals, judges or ambassadors; referendarii, secretaries who kept the king’s ring, as well as stenographers and clerks; and stewards who administered the royal treasures. Since the Merovingian kings were often leading military campaigns or roving among their various lodges and villas, these court officials were travelling companions as well as royal agents and administrators. Other royal magistrates served outside the courts. Because the Merovingian kingdoms did not respect the boundaries of the old Roman provinces, the largest administrative units that survived from the Roman Empire were the cities, that each usually still included an urban centre and a large surrounding rural hinterland. For many of the cities under their control, kings appointed counts with various responsibilities, including dispensing justice, collecting taxes, and enrolling and often also commanding the local military levies. Kings also appointed dukes, who often commanded armies, sometimes served as ambassadors, but soon became local administrators of larger regions within the kingdoms. During the sixth century the kings of Austrasia appointed dukes for Champagne, for the Touraine and Poitou, for eastern Aquitaine and especially the Auvergne, and for Marseilles and a part of Provence. The kings of Neustria appointed dukes for Soissons and the surrounding area, for the region between the Somme and the Loire, and for Toulouse and a part of Aquitaine that included Bordeaux. The kings of Burgundy appointed dukes for Orléans and the surrounding area, for a collection of cities in Aquitaine, and for Arles and a part of Provence. In Provence the governors were usually known by such Roman titles as rectors, prefects or patricians. Dukes commonly supervised, or at least had higher rank than, the counts within their regions, although there were few counts in most of Austrasia and in Provence. So because these royal administrations combined new and traditional elements, they were certainly neither systematic nor uniform. Shaping and imposing a Merovingian administration in Gaul was an ongoing process throughout the sixth century.

From the essay, 'Merovingian Gaul and the Frankish conquests' by Robert Van Dam in The New Cambridge Medieval History: Volume 1 c.500–c.700, edited by Paul Fouracre (Cambridge University, 2005)