"They said, 'Have you come to us with the truth, or are you one of the jokers?'" meaning: the mockers.
﴿قَالُوا أَجِئْتَنَا بِالْحَقِّ أَمْ أَنْتَ من اللاعبين﴾ يَعْنِي: الْمُسْتَهْزِئِينَ.