Can 2 girls make a baby?

Not unless you adopt.

No......its impossible unless one of them was originally a man

It's usually impossible for two women to have a child that is genetically related to both, but it is possible to use the egg of each woman and create one viable egg that could be implanted, although it would be wildly expensive, and the success rate might be low.

Some women in these situations have children using a sperm donor, and others have one woman carry the egg of the other, so that legally both women have some claim on the child.