Same word as knickknack:

bagatelle, bauble, bibelot, bric-a-brac, conversation piece, curio, curiosity, device, embellishment, flummery, frill, furbelow, gadget, miniature, notion, novelty, objet d'art, ornament, plaything, showpiece, souvenir, thingamajig, toy, trapping, trifle, whatnot, w