according to wikipedia

"In speculative theories of quantum gravity, the graviton is a hypothetical elementary particle that mediates the force of gravitation in the framework of quantum field theory."

No, gravitons are different, hypothetical particles. From what I understand, they are kinda like photons but instead of electromagnetic they carry gravitational information.

Photons, 8 gluons, W, Z, Hawking's particles, gravitons, ect. are bosons. All bosons carry fundamental forces. Neutrino isn't boson (it's fremion). It's created during p + p fusion. It doesn't carry any force like bosons. Also, we have six different types of neutrinos (including anti particles).