The Internet search engine, Google, has launched a test site for comparison online shopping on the Web. Known as "Froogle," it focuses on products that are for sale, posting images and prices of merchandise for sale at various online merchants. Other Web sites actually have more information on their shopping portals for more efficient product comparison-shopping. But the difference between those sites and Froogle is that Froogle doesn't charge merchants that are included in its search engine. Froogle maintains that it will be profitable by selling advertising on the Web site, as Google does on its Web site. The Froogle beta site is up and running at www.froogle.com .