• 19.044 for the help of the Lake-people,

this one is not attested in OED, although “lake-dweller” and “lake-man” are.

“lake, n.4.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/105168. Accessed 14 September 2017.

• 07.092 The dogs could stand on their hind-legs when they wished,

This word is not in OED  as one word – a JRRT original.

• 05.009 or half-imagined dark things coming out of them.

Although many things combine with “half-” in the OED, this one is not found there.  It’s not unique to Tolkien, but we are using the JRRT tag to include those words that he may not have invented, but certainly used and which are not dictionary-supported.

• 11.014 grassy-floored, still and quiet.

Not found in OED.

• 13.035 in a coat of gold-plated rings,

Although the nouns “gold-plate” and “gold-plating” are in OED, this word is not.  That seems very strange to me, so I double-checked.  “Plated” is a perfectly good adjective, and it seems that various combinations with the metal which is doing the plating does not make compound words, according to the OED editors.

“gold, n.1.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/79763. Accessed 13 September 2017.

“plated, adj.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/145355. Accessed 13 September 2017.

• 03.035 in Gondolin for the Goblin-wars.
• 05.006 in Gondolin for the goblin-wars

This word is not found in OED.

• 06.034 You lose track of time inside goblin-tunnels.

This word is not found in OED.

• 04.019 And down down to Goblin-town

Is this the name of the place, I wonder?

This word is not found in OED.

• 06.061 Now it seemed that a great goblin-raid

This word is not found in OED.