The Etymologies seem to list this word as a noun, but it is clearly the third person singular of the verb
Noldorin
tôl
verb. (he) comes
blâb
verb. (he) flaps, beats
helch
noun. bitter cold
lhammas
noun. account of tongues
lhâf
verb. (he) licks
lhôd
verb. (he) floats
orthor
verb. (he) masters, conquers
osgar
verb. (he) cuts, amputates
rhing
adjective. cold
rhing
adjective. cold
rhíw
noun. winter
síla
verb. (he) shines white
sôg
verb. (he) drinks
thia
verb. it appears
tog-
verb. to bring
A verb in The Etymologies of the 1930s glossed “to bring” under the root ᴹ√TUK “draw, bring”, appearing in its (Noldorin-style) infinitive form tegi and its present tense form tôg (Ety/TUK). It was originally glossed as “to lead, bring”, but “lead” was crossed out (EtyAC/TUK).
tol-
verb. to come
tol-
verb. to come
tôg
verb. (he) leads, brings
According to WJ/301, the expression tôl acharn "vengeance comes" was later changed to tûl acharn by Tolkien