A verb appearing as G. canga- “to tangle” in the Gnomish Lexicon (GL/25), probably based on the early root ᴱ√KANGA or ᴱ√KAŊA “weave, twine” (QL/45, 98). Elsewhere in GL Tolkien had the similar and probably related intransitive verb cinga- or cangi- “to go wrong, get tangled”.
Neo-Sindarin: I would retain the verb ᴺS. canga- for purposes of Neo-Sindarin based on a Neo-Root ᴺ√KANGA “✱tangle”, incorporating the meanings of both transitive “tangle” and intransitive “get tangled, [by extension] go wrong”.
A word appearing as G. cang in the Gnomish Lexicon, functioning as both an adjective “tangled, confused, mixed up, awry, wrong” and a noun “tangle, confusion, mêllay” (GL/25). It is likely based on the early root ᴱ√KANGA or ᴱ√KAŊA “weave, twine” from the contemporaneous Qenya Lexicon (QL/45, 98).
Neo-Sindarin: I would retain the word ᴺS. cang for purposes of Neo-Sindarin based on a Neo-Root ᴺ√KANGA “✱tangle”.