What were the names of the national legislative bodies before and during the period of the Articles of Confederation and Perpetual Union?

Continental Congress.

Confederation Congress.

Explanation:

Continental Congress was first the convention of persons chosen as representatives from different British American colonies when the American revolution was at it peak,

this Congress served between 1774 to1789 as the government to all the 13 colonies which later became the United States of America.

The Confederation Congress served as the part of government established to handle the legislative, it was established by an Act of Articles of confederation when the United States of America newly became independent. They were empowered to declare war, settle issues, sign treaties, etc.