What kind of WWII aircaft is this? I saw this plane at a warbird fly in and would appreciate some assistance identifying it. 

I can only tell you what I'm rather sure it's not..

Grumman TBF Avenger

Other US-operated Torpedo Bomber types

Grumman F4F-3 Wildcat

Republic P-47 Thunderbolt

Any ideas?



[EDIT]

Also, is this yellow aircraft the same model, only with a different paint scheme? The nose looks different, but perhaps the cap/cone has been removed, perhaps for maintenance. Otherwise the canopy, wheels, and gear covers look identical.
A North American T-6 Texan Trainer, probably the NJ/SNJ Texan variant.



"SNJ-1 at NAS Pensacola c1940" by U.S. Navy - U.S. Navy National Museum of Naval Aviation photo No. 1996.488.166.090. Licensed under Public Domain via Commons.

The North American Aviation T-6 Texan is a single-engined advanced trainer aircraft used to train pilots of various air forces including (but not limited to) USAAF, USN, RAF from (before) WWII well into the 1970s.