Are there any Trinitarian Protestant denominations that deny the doctrine of the eternal generation of the Son from the Father? Are there any Trinitarian Protestant denominations that deny the doctrine of the eternal generation of the Son from the Father?  By "denomination" in this context I am excluding any sects, Unitarians, or Oneness groups. 

"Eternal generation of the Son" excludes any form of Arianism based on this usage, and is the historical view expressed in the Nicene-Constantinopolitan creed. As I am anticipating the answer "no," an example of a good answer would be, "This group is an example and their position is this."
The Churches of Christ appear to not espouse the doctrine of eternal Sonship; 
however neither do the deny Christ's eternity or His divinity. 

See "Eternal Sonship" on this Church of Christ's web page, and their about page identifying them as Church of Christ.  

See "Jesus the Son of God Eternally?" Bullet "2. The Denial of Eternal Sonship" in a magazine published by Church of Christ, and their about page identifying them as Church of Christ 

Adam Clark, a Methodist theologian, not representing the beliefs of His denomination, did not espouse the doctrine of eternal Sonship.  

John MacArthur for a long time did not espouse the doctrine of eternal Sonship, but recanted his stance.  

I found some others listed who do not espouse the doctrine of eternal Sonship.