[ClassSHero]

Not sure who any of these are.

2 of the cars look like feet for a combiner not sure who.

One kind of looks like an old school targetmaster

and the fourth is a car with a 2000 hasbro stamping on it that transforms into mini robot

[Kalus]

1,2,3 are "Power Core Combiners"

1. Junker Drone (Over-Run with Stunticons 2011)

2. Armored Junker Drone (Mudslinger with Destructicons 2010)

3. Dune Buggy Drone (Mudslinger with Destructicons 2010)

[ClassSHero]

Thanks for the help

[Scaleface]

#4 looks to be the 2003 Transformers Universe Autobot Camshaft, who is Shattered Glass Camshaft.

Camshaft (SG - Transformers Wiki)