A word in the Gnomish Lexicon of the 1910s glossed “acorn”, a combination of G. grôn “oak” and G. nocha “an acorn” (GL/42, 62).
Gnomish
nocha
noun. acorn
gronoch
noun. acorn
govron
noun. acorn
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A noun appearing as G. nocha “an acorn” in the Gnomish Lexicon of the 1910s (GL/61). It had no obvious Qenya cognate, so its derivation is unclear.
Neo-Sindarin: Since there are no later words for “acorn”, I would adapt this word as ᴺS. noch “acorn” for purposes of Neo-Sindarin.