In Sims 3 there was a house called Shotgun Style in Sunset Valley. It was a little starter home, two bedrooms, one bathroom and a kitchen that joined onto a living room style area, but the lot it was on came with a lot of extra space for building.
Actual Shotgun Style homes more closely resemble starter homes in 4 like the Crick Cabana. They were popular in America up until the 1900s at some point, I think. Quite old fashioned, small, sort of narrow.
That house basically doesn't resemble one at all.