In Japanese, the work "Manma" is a baby-talk word that means food. "Mama" is used for mother sometimes, but I think this is a recent influence from the West. "Haha" is the normal (non-polite) word for mother, although children are taught to use the more polite "o-kaa-san." "Haha" still has those repeated "ah" sounds.
Haha isn't the normal word for mother, you only use it when talking about your own mother to someone else in a formal setting. Mama has the most casual sound to it. Okaasan (or one of its derivatives) is slightly more formal. Depending on the family, you might use either when talking to your mother.
