Answer removed due to answer of the question always deriving from opinions, therefore it has been locked.
There is a horror movie from 1977 about a killer alligator called 'Eaten Alive' And there is a 2007 Australian movie about a killer crocodile called 'Black Water'.
The movie is called 'The Leprechaun'.
The 1988 release of the movie 'Pulse'.
robot monster
Scream
Very doubtful.
Johnny Grimes was the killer in the movie "Room 13" He was played by Taylor Goligoski.
attack of the killer tomatoes
I believe the movie you are thinking of is Scream.
There are lots of movies, but one of them is Disturbia.
Sleepaway camp
In the attic