A verb in the Gnomish Lexicon of the 1910s given as {galta- >>} galtha- “kindle”, apparently a transitive or causative variant of G. gal- “shine (golden)” (GL/37).
Gnomish
tund
noun. log for the fire
galtha-
verb. to kindle
tan
noun. firewood
A noun in the Gnomish Lexicon of the 1910s glossed “firewood”, derived from ᴱ√tan- (GL/69).
A noun in the Gnomish Lexicon of the 1910s given as G. tund “a log for the fire” and derived from ᴱ√tudh- (GL/42).
Neo-Sindarin: I think this word may be salvaged in Neo-Sindarin as ᴺS. tund, a general word for “firewood” based on the Neo-Root ᴺ√TUD.