What is it called when you have two oboes two bassoons and two french horns?

When you have two oboes, two bassoons, and two French horns, it is typically referred to as an "octet" in the context of chamber music. This ensemble configuration is part of a larger group known as a woodwind and brass octet, which traditionally includes various woodwind and brass instruments. The specific combination you mentioned allows for rich harmonic textures and varied timbres in performances.