Help with word translation

mae govannen! I'm trying to translate one of my favorite songs, "Leaves from the Vine", into Sindarin, but I'm not sure how to translate the word "shell"; I believe it's referring to sea shells. Thank you for your time!

  -Tolchalad

The word for shell is half “seashell”.

Thank you, Rinor! This is a big help. :)

One more thing.... How would one say "vine"? Thank you once again!

Sure thing, although there is no word for "vine" but we could coins a Sindarin word for it from the Quenya word liantassë “vine” which would be lhingas. Although, this is hypothetical as ᴺS. [N.] ^lhing, n. has been glossed as "spider’s web, cobweb". It comes from ᴹ√SLIG “*entwine, thread; spider”.

Another thought maybe using ᴺS loeth “twist, tendril, spiral, coil” with the abstract -as for loethas.

Or one step further GAL² “grow (like plants), flourish, be healthy, be vigorous, bloom + rath S. reth n. “*climber” galreth. But a second option is always advised.

That was so fast! Thank you so much, Rinor, you have been such a big help!

Another thought longalas vine (lit.) curl-plant from lonc + galas

Oh, that's another good one!