Cowboy, If you can find out if its a coconut, date, or type of palm which sprouts a berry then you have a chance of getting a bow out of it. Other palms usually are to pithy and light in density to make a bow. If you can cut a cross section and it doesn't look like its all stringy then it may be good.
If its been dead for a while that may not be good either since palm being a grass tends to break down very fast...