As I understand it, "Mama" was his nickname for his girlfriend.He was yelling for his mother, ...
Chauvin Trial BREAKING: “Mama” Was George Floyd’s Nickname For His Drug-Sharing Girlfriend
Girlfriend also testifies Floyd had previously taken illicit drugs that caused great stomach pain, as during arrest, gave him great energy, and made her feel like she was going to die when she took it.
legalinsurrection.com
George Floyd transcript reveals last moments: 'Momma, I love you. Tell my kids I love them. I'm dead'
His dead mother couldn't have told his kids anything. He was pleading for his girlfriend to tell his kids.