Welcome to the nut house!
They're pines of some sort it looks like, but clearer and more detailed pics might help narrow that down.
I'll wait for someone smarter than me there.
Do you know anything at all about how they were cared for before you? What's the soil like? If dry, or compacted? It could be as simple as no one has been watering them.
Technically, they aren't quite bonsai yet. That would take some styling and a pretty pot.