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.
grinn
noun. ankle, wrist
grind
noun. ankle, wrist
talgrin(d)
noun. ankle
A word appearing as G. {talrid >> talrind >>} talgrin(d) “ankle” in the Gnomish Lexicon of the 1910s (along with a number of other rejected variants), a combination of G. tâl “foot” and G. grinn “ankle, wrist” (GL/69) and analogous to G. mabrin(d) “wrist”.
Neo-Sindarin: For purposes of Neo-Sindarin, I would adapt this early word as ᴺS. tallif “ankle, (lit.) foot-link”, with a second element S. lîf “link” as seen in the 1968 word S. molif “wrist, (lit.) hand link” (VT47/6).
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 in the Gnomish Lexicon of the 1910s given as {grind >>} grinn “ankle, wrist”, an element in G. mabrin(d) “wrist = ✱hand grinn” and G. talgrin(d) “ankle = ✱foot grinn” (GL/42, 55, 69). As such, it seems to refer to a body joint, but specifically limited to wrists or ankles. It may be related to (a variant of) the element rikta in ᴱQ. marikta “wrist” under the early root ᴱ√RIKI (QL/80).