Mix the sugar and cocoa with a spoon while dry. Melt the butter and stir in the cocoa and sugar mixture until the sauce is thick enough to spread on uncooked bread. Lay the crescent rolls out flat on a pan and spread the chocolate sauce on each. Think about how you plan to roll up the pastries when applying the sauce so that it does not spill too much while cooking. Follow the baking instructions on the package of the crescent rolls.