Light-weight alder for sure - I've encountered very heavy alder on Fender basses. Ash also, but depending on the strain ash can be lighter in weight.
Density can vary in any type of wood. You can easily select lumber based on grain spread, and get a piece that's less dense, and potentially lighter weight. The problem is lower-density wood can still be pretty heavy based on moisture content.
I'm guessing Fender kiln-dried the bodies for these instruments. This would account for Road Worns being consistently resonant sounding and lightweight at their price point - Selecting already-aged wood is expensive, something I suspect Fender only only does for higher $$ custom shop basses and guitars.
BTW, "Swamp Ash" is the same type of ash you find in furniture, only because it grows in wetlands or low areas, it's a low-density wood once seasoned (or kiln-dried) due to removal of its native high moisture content.
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