HONG KONG—Advertising firm Leo Group said it is applying to a Chinese court to freeze $356 million yuan ($55.06 million) in assets of Evergrande Group for overdue payments, the latest supplier to sue the indebted property developer. Leo’s lawsuit disclosed in a securities filing late on Monday comes after Huaibei Mining Holdings said last week its construction unit is suing Evergrande over an overdue $400 million yuan in fees. And Langfang Development said last week a court has ordered Evergrande’s shares in the company be frozen for three years following a ruling on a lawsuit between Evergrande and an investment company. Worries over the financial health of China’s No.2 developer intensified after it said in June it did not pay some commercial paper on time, and on news last month that a court froze a $20 million bank deposit held by the developer on the request of Guangfa Bank. Separately, …