Tusken Raiders that could speak Basic.

Is there any?

Darth Krayt.

A'Sharad Hett, even though he wasn't a biological Tusken Raider. I don't know if a Tusken could learn to speak Basic

A'Yark could, so could Yark.

They can be taught Basic.

If they're even part human, they don't count, imo.

A'yark and Yark aren't.