A verb appearing as G. dod- “fall down, drop” in the Gnomish Lexicon of the 1910s (GL/30), clearly based on the early root ᴱ√ÐOTO “drop, fall” (QL/86).
Neo-Sindarin: There is a later verb danna- “fall”, but no later verb for “drop”, so I would retain ᴺS. dod- “to drop” for purposes of Neo-Sindarin, based on a Neo-Root ᴺ√DOT of the same meaning.
The word G. dod “berry” appeared in the Gnomish Lexicon of the 1910s above G. dod- “fall down, drop” (GL/30), so perhaps originally meaning “✱a thing dropped”.
Neo-Sindarin: I would retain ᴺS. dod “berry” for purposes of Neo-Sindarin as a derivative of the Neo-Root ᴺ√DOT “drop”.