As dionasaur suggested a tooth brush or something abrasive to etch at the dried compound in the cracks should work.
How to get joint compound off wood floor.
Sheetrock almost always involves a messy installation and despite any precautionary measures to keep the area clean most installers can attest to the possibility of sheetrock mud finding its way to the floor below.
Most of the time the mud is easily cleaned up before it has a chance to dry.
I don t think a vacuum or mop will work as the drywall joint compound is now hardened into your wood flooring.
Avoid spreading it around the floor.
All purpose drying type compound is water soluble so the mud should easily shed off.
Since drywall compound is water based it is generally pretty easy to get off of your carpets and rarely leaves no lasting damage.
Even ground in mud can be removed with some patience and elbow grease.
Wipe up any drywall compound spill immediately.
Of course some jobs are easier than others and even though drywall compound can be removed you may need to try a few different tactics.
You want to dissolve and break up the compound.
Use a warm wet cloth to wipe up the compound.
The sooner that you clean up the compound the easier it will be to remove it.
For surfaces lightly rub off with a warm damp cloth.
Try to dab it quickly and rinse the rag in warm water frequently as you dab the compound up with the rag.
For goopy semi set drywall mud you can soak tools in hot water for about 10 minutes.
Weekend home improvement aficionados are even more likely to get mud on the floor.
How to get drywall texture off wood floors.
I would try vinegar and a brush.