prob a stupid question,but...

is there any way to use open gl
with like turbo c++
to target dos
in plain ole graphics modes
or even vesa modes?

No.AFAIK there’s no OpenGL-Port for DOS,so you’ll have to use either plain VESA or something like 3DFX’s Glide if you want to do fast graphics in DOS (or Mode13 via Assembler )

Mesa3D have a DOS driver if I remember correct.