Greetings Sherry,
Obligate wetland tree species, both angiosperms and gymnosperms, common to South Carolina include baldcypress, pondcypress, water tupelo, swamp tupelo, pumpkin ash, swamp cottonwood, etc. Growth rates for the aforementioned are average to moderate depending on soil/site conditions, with swamp cottonwood probably being the fastest growing species of the mix.
However, I would strongly suggest that you contact an extension forester at Clemson University for specific recommendations - they can provide you better details regarding tree planting techniques, nursery stock recommendations, and species recommendations for planting trees in standing water environments.