Could Turn Black into White?

"He could turn black into white" is a metaphor for Squealer literally being able to take a bad situation or argument and make it so he could get everybody to believe the point he wants or the animal he's working for. Whatever goes upon two legs is an enemy.

What does Squealer could turn black into white mean?

In the novel the others said that squealer could, “turn black into white” meaning he could sway anyone's decision into believing what he said.

Is Snowball a pig in Animal Farm?

Snowball is one of the key pigs who take the teachings of Old Major and turn them into a way of thinking called 'Animalism'. He is an intelligent and animated pig. He comes up with new ideas and cares about the working animals.