HOGLE ZOO INTRODUCED ITS LATEST DEBUTANT, A 5-MONTH-OLD MALE POLAR BEAR, TO ZOOGOERS SATURDAY AT NOON. CHINOOK, THE ZOO'S FEMALE POLAR BEAR, GAVE BIRTH TO THE YET-TO-BE-NAMED BABY NOV. 9. THE CUB, BARELY A POUND AT BIRTH, SPENT ITS FIRST MONTHS WITH ITS MOTHER INSIDE A "CUBBING DEN" UNDER THE CARE OF ZOO OFFICIALS. NOW WEIGHING IN AT 52 HEALTHY POUNDS, THE NATIVE OF THE NORTH TOOK ITS FIRST TENTATIVE STEPS OUTDOORS. MOTHER AND SON WILL BE ON DISPLAY DAILY AT THE ZOO.