Why have you imprisoned them

tomato plants are vines, meaning they often dont stay upright, this thing is just to support it

Free them

So they don't grow weirdly.

free them from their imprisonment

its a support structure so the poor thing doesnt grow weird and topple over

I'm kind of an idiot so forgive me, but what kind of plant is that?

I so far only know a small bit about Jalapenos and plums.

this is a tomato plant, specifically 4th of July Hybrid tomatoes

I was thinking that it was possibly a tomato plant because of the cage.

thats actually a baby tomato

Good, those are good plants