A noun appearing as G. salfinc in the Gnomish Lexicon of the 1910s, apparently a diminutive form of G. salf “bowl” (GL/66).
Neo-Sindarin: Since I prefer ᴺS. tolph for “bowl” to avoid conflict with N. salff [salph] “broth”, I would update this Gnomish word to ᴺS. tolpheg “spoon” using the later diminutive suffix -eg.
The Gnomish Lexicon of the 1910s had G. {salpa >> salp >>} salf “bowl, basin” (GL/66), clearly based on the early root ᴱ√SḶPḶ which also had ᴱQ. salpa “bowl” (QL/84).
Neo-Quenya: The Etymologies of the 1930s had N. salff “broth” under the root ᴹ√SALAP (Ety/SÁLAP). To avoid a conflict, I would coin a neologism ᴺS. tolph “bowl, basin” based on ᴱQ. tolpo of the same meaning from Early Qenya Word-lists of the 1920s (PE16/142).