Will paralleling forward diodes decrease voltage drop?
Yes, it will decrease the forward voltage drop somewhat. It will also double the reverse leakage.
If we use 150mA as the forward current, and do a simulation the typical difference is  0.698V for one diode and 0.515 V for two in parallel.
At 25V and 100°C Tj the typical reverse leakage is about 55uA for one diode, and double that, 110uA for two.
Of course self-heating will be less- in the case of 150mA the thermal resistance to ambient is stated as 430K/W when mounted in the specified way- so if the single diode has 150mA the dissipation is 0.105W so 45°C rise, so if the Tj is 100°C then the ambient must be 55°C. In the dual diode situation, the temperature rise is going to be only 33°C, so the Tj will be 88°C and the actual reverse leakage will be closer to that of a single diode. It will only be double when self heating is negligible.