It's happened before.
The word 'drow' is not copyrighted. That would be very impossible. However, the AD&D drows are... Lloth or whatever, for example, is entirely a TSR baby, and if your drows worship Lloth, you're probably in violation.
You should call them trolls and then include, in the helpfile, an explanation about "dtrow". Then you could describe your mud as educational. ^_^
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