Early Quenya
tenge-
verb. to know, understand, grasp, think
tenge
noun. finger
ista-
verb. to know
lepta
noun. finger
let
noun. finger
tenna
noun. finger
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 for “finger” in the Qenya Lexicon of the 1910s under the early root ᴱ√TENE “touch, feel” (QL/91). It was also mentioned in the contemporaneous Poetic and Mythological Words of Eldarissa, but with -nd- written above it indicating a variant form tenda (PME/91). A similar word tenge “finger” appeared Early Qenya Word-lists of the 1920s (PE16/137), but ᴱQ. lepta was written next to it, perhaps as a replacement, since after this point finger-words were primarily based on √LEP.