Basically because of what kids used to call him when he was going to school
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Piggy and Jack are complete opposites so they were bound to but heads. In the beginning Jack and Piggy didn't have a problem with each other but as the story progressed the more Jack hated Piggy. It never really stated why they don't get along but I think that it's because Jack has a different personality. Jack is power thrived while Piggy is more intellectual. Hope that helped!
The only jobs which are specified in chapter one are... Piggy is told to "take names. That's your job." Jack decides that his choir will be hunters and Ralph appoints Jack and Simon to accompany him on an expedition to discover whether they are on an island or not.
At the start of the book Piggy asked Ralph what his name was so it was obvious they didn't know each other. Once Ralph had blown the conch and boys had started to arrive at the platform Piggy asked them for their names, evidence that they were strangers to him. When the choir, led by Jack, arrived Piggy made introductions, which indicated that the boys in the choir didn't know any of the other boys. At the end of the meeting when Ralph, Simon and Jack were heading off to climb the mountain Ralph told Piggy that his job was to collect names. If he'd known the other boys he'd have already known their names.
Ralph said that near the end of chapter 2: Fire on the mounatin when Piggy admitted that he didn't know the names of the littluns.
There was no real conflict in chapter one; The Sound of the Shell. Ralph and Jack were both contenders to be chief but the issue was settle by a vote, which Ralph won. The only other slight conflict was when Ralph chose Jack and Simon to accompany him on the expedition to climb the mountain. Piggy wanted to go to and Jack told him in no uncertain terms that he wasn't wanted.