"The time has come," the Walrus said,
"To talk of many things:
"Of fizgigs, flukes and folderol--
"Of frumpery and feazings--
"And where the boondocks can be found--
"And why whangdoodles have no wings."
-Alison Wonderlicht

there must be a gazillion of these; but here are a few:

gadgets: gizmos, doohickeys, thingamabobs, doodads, widgets, whirligigs
knicknacks: gimcracks, trangams, whigmaleeries, fizgigs, tchotchkes, bibelots, folderol
from Mad magazine (in the 50s): veeblefetzer, furshlugginer, squamish (the 43-man variety)
from my friend John: contravivulating, goofaglarbian, furthermoreover
others: pakaloomer, brackerfritch, farshimalt(?)

anyone ever heard these latter three?