Its hard to offer a specific name of driftwood that is good for them because many of the pieces sold in pet stores are not labeled by wood species name. You will have to use your best judgment and handle the wood before choosing. Its pretty easy to tell if you have a soft wood or hard wood just by weight. Harder woods are more dense, thus they are heavier.
1 to stay away from is Wellaby. Also, if adding wood, be sure to watch your pH, Gh, and Kh in the tank water. Some woods have more tannins in them than others, which will soften water as those tannins are released. The longer it is submerged the more tannins build up in the water. If the water starts to go tea colored you know you have heavy tannins. Lots of water changes to keep the levels low so your water chemistry isn't swinging all over the place is the best way to control it if you don't wish to remove the wood. Wellaby wood is known for its heavy tannins and softening abilities.
Malaysian drift wood is a softer wood, but tends to have heavy tannin levels also.
Just be careful.