We received this note from a close friend of A. Troll:

Our troll is mostly interested in getting mail from little
people as they come to visit, not that our troll will not reply to any
letters received.  Since I am closest in familiaity to our troll,  I
will forward a copy of the letters received and the replies sent to you
to be published.  The sender should include their name, building of
residence and unit number, and the letter, or preferrably, note, should
be brief.