it should. Never hurts to try. I would think, from previous transplanting experience, that this is the time of year to do the transplanting or should we say, transfloating. I believe it is like many aquatic plants that it is not attached in anyway.
Now, as far as around these parts, Duckweed only grows in cypress swamps, so if you plant it in an open water area, it may not grow.
Breeding and Training Boykin Spaniels, a True American Gundog