Turkeys say, "gobble". We also "gobble" down a lot of turkey on Thanksgiving. This is just a bit of idle musing, but are the two meanings of this word somehow related via the American & Canadian holidays?
Etymonline has this:
gobble (1) "eat fast," c.1600, probably partly echoic, partly frequentative of gob, via gobben "drink something greedily." Related: Gobbled; gobbling.
gobble (2) "turkey noise," 1680, probably imitative.
The Free Dictionary agrees. So it appears that these are actually two unrelated words that just happen to be spelled identically (much like cleave).
The O.E.D. lists "gobble" as a noun meaning mouth, and "gobbling" as gorging, the latter dating from 1630. Still, I would not be surprised if the verb form meaning the sound a turkey makes is at least in some sense onomatopoeic. Where the two senses may be related is likely to be a confusion of the two.