sillohed,
As albatross says, great photos.
Your closeup photo is of an Airco DH4, the forerunner of the DH9. The big difference is that the cockpit of the DH4 is under the wing, between the interplane struts. The DH9 fuselage was redesigned to move the cockpit aft, away from the engine and fuel and closer to the gunner. Judging by the campaign hat of the soldier in the rear cockpit and the M1911 he is holding, I think this must be a US Army DH4.
Concerning the crashed DH9, as Mel says, it looks like it was converted for civilian use. I think the engine is the Liberty L-12, which is consistent with a DH9A (or the American produced USD-9 and 9A). The name "Ninak" or "Nine-ack" was an unofficial phonetic nickname. The letter A was called "Ack" during WWI, rather than the "Able" and then "Alpha" of later years.
Your last photo certainly does look like Camel, but the wingtips seem a little odd.