From WordNet (r) 2.0 (August 2003) [wn]:
flotilla
n 1: a United States Navy fleet consisting of two or more
squadrons of small warships
2: a fleet of small craft
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Flotilla \Flo*til"la\, n. [Sp. flotilla, dim. of flota fleet;
akin to F. flotte, It. flotta, and F. flot wave, fr. L.
fluctus, but prob. influenced by words akin to E. float. See
Fluctuate, and cf. Float, n.]
A little fleet, or a fleet of small vessels. Flotsam