A log cabin (sometimes just referred to as a cabin) was a building constructed out of wooden logs.
In 2151, Trip Tucker commented that it might be nice to have a cabin in the woods on a Class M planet they were exploring. (ENT: "Strange New World")
As a boy, Chakotay built a few log cabins because his father believed it was important that he know how. Chakotay related this to Kathryn Janeway in 2372 while considering how best to add on to the modular shelter they were living in. (VOY: "Resolutions")