We don't have synonyms for targe yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are large, barge and tare.
"1819: The Jester wore his usual fantastic habit, but late accidents had led him to adopt a good cutting falchion, instead of his wooden sword, with a targe to match it -- Walter Scott, Ivanhoe"
"1819: The Jester wore his usual fantastic habit, but late accidents had led him to adopt a good cutting falchion, instead of his wooden sword, with a targe to match it -- Walter Scott, Ivanhoe"