All insects have six legs. There are many many tiny ones. You need to be more specific.
Ants Earwigs have the pinchers or "cerci" at the back end.
You need to be much more precise. Insects have 6 legs. Spiders and other arachnids have 8 legs. Millipedes and centipedes have many more.
Earwigs have a big orange head with pinchers at the end. They can also have a striped body and six legs.
Pinchers in the back sounds like an earwig.
the lobster-like insect is called a 'pseudoscorpion'
I don't think there are bugs with four legs.
I found this on the "what's that bug" website. They called it a Solpugid.
a bee
a stag beetle
a green and brownish bug that folds its front legs as if it is praying
An earwing is a ugly looking bug that has pinchers that DON'T PINCH. Its related to a ant but uglyer.