In researching information for the Japanese LST 150 that Umi constructed I came across a photo of a German tank transport. It was a B&W photo of it under way. It appeared very much as a simple barge with a central aft pilots cabin that stood above the height of the tanks that were on board. It stated that it carried a 3" gun and a twin 40mm and several machine guns. I am looking for this photo as I do not seem to have saved it.
The term "F" boat for a German vessel, to me has always referred to a small coastal escort, about the size of the T 1-15 series but with inferior machinery.
The MFP were to me a tank transport very similar to the allied LST's but with a lower profile.
This is a link to a drawing of a MFP:
http://mlib.rost.ru/sections/mkonst/1997_desant/mk1997-03.htm