In another thread, a commenter said that "tátl'id" means "moss" as in river moss, etc. He also said an alternative word for "green" is "ch'ilgo dootl'izh" -- thank you for your observation about grass: I am now thinking the one is "moss green," while the other is "grass green" . Fascinating!
Wiktionary seems to have a handle on this: tátłʼidgo dootłʼizh means "agae green," ch'ilgo dootłʼizh technically "plant green," bearing in mind that dootłʼizh is a broader color word that includes everything from the English "green," "turquoise" and "blue." Just curious how far in that spectral direction it goes -- is the color violet also covered by dootłʼizh?? Also note that Wiktionary (and some commenters here) insist on the added t, in both táTłʼidgo and dooTłʼizh. Dialect difference?