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).
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).