BERLIN (Reuters) - Germany's youngest celebrity, Knut the polar bear cub, made his much-anticipated public debut at Berlin Zoo Friday and appeared unfazed by the media scrum surrounding his first excursion. The three-and-a-half-month old white cub padded gingerly round his new enclosure to the gasps and sighs of onlookers. Fortified by a breakfast of porridge, the puppy-sized cub sniffed the grass and rolled in the dust before delighting the crowds by splashing in a pond. "I want to take him home," said Daniel Wolff, five, whose mother had bought him a specially made "Knut" cuddly polar bear toy on sale on a stand outside the enclosure. Knut stole the heart of Berliners after he was born in December but rejected by his mother Tosca. A bearded zookeeper moved into the enclosure to look after him round the clock. But Knut's fate grabbed global attention after an animal rights campaigner said hand-rearing polar bears was a violation of animal rights. German media inter