No, that is not the way it goes. Fiddlers in the know buy banjo cases for their fiddles. That way they know that no one will bother stealing them!

About the clawhammer terminology~~around here you are just as likely to hear it as frailing, rapping, drop thumbing, old time, or best of all, the right way! Like Dave T says above, most frailers use open back banjos, but the use is not universal. Notable exceptions are Uncle Dave Macon, of course, and Missourian Cathy Barton. On the other hand, I have really only noticed one person playing three finger style on an open back banjo, and that was someone who usually frails.

Another point that no one has addressed yet, and I really am not well enough versed on this, but I will start it. Many frailers use a combination of metal and nylon strings, rather than all metal. Also frailers who play constantly use some sort of hardener on their finger nails, or even false nails because of the wear and tear on their nails. OK, I will let someone who really knows what they are talking about take it from there.