Possibly Wes Craven's The People Under the Stairs (1991)? They weren't trolls, though, they were deformed people or something (I forget exactly...haven't seen it in a long time).
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The name of the horror movie is called 'The People Under The Stairs'.
The people under the stairs
The Munsters : Spot was Eddie Munster's pet dragon whose lair is under the stairs .
Spot
Eddie's pet dragon was named Spot .