What are these crimp type connectors called?

Question

I used to get these crimp type electrical connectors from graybar when I was younger. they are about the size and relative shape of the business end of an uncut key They are metal and covered in some type of rubber or plastic insulated material. They are also hollow inside and have jagged teeth inside. all you do is insert wires unstripped and smash with pliers then you have crimped the wires. what the h**l are these things called?

Answer 1

crimp lugs to me.

Answer 2

Alligator Clips / Crimps ?