No. 3P1S = 3 cells in parallel, 1 in series. Output voltage would be same as cell voltage, but current capability would be tripled.
1P3S = 1 cells in parallel (by itself), 3 in series. Output voltage is triple cell voltage. You can't just use three chargers unless you either isolate the chargers from each other or disconnect the batteries from the circuit (same as removing and charging individual batteries). Remember the interconnections between the batteries in-circuit affect the charging circuit!
There is one more option. You can simply charge the pack as a whole and not worry about balancing at the cell level. If the cells started out reasonably identical in capacity and balanced, it'll work for quite a while, but not as long as a properly balanced pack.