When Sauron burned that region to stop the advance of the Last Alliance down the Anduin, the Entwives were likely wiped out, although some might have been captured and enslaved as agricultural workers or have escaped into the east of Middle-earth. The Ents held that the Entwives were lost.
Treebeard would tell Merry and Pippin that the Entwives would love their country. Indeed sometime before the War of the Ring, Halfast Gamgee claimed that he saw an elm-like "Tree-Man" walking in the North Moors. However, it was never learned whether the "Tree-Man" was an Ent, an Entwife, or just a story.
One of the primary daggers on the survival of the Entwives is found in Letter 144 of The Letters of J.R.R. Tolkien:
"I think that in fact the Entwives had disappeared for good, being destroyed with their gardens in the War of the Last Alliance (Second Age3429–3441) when Sauron pursued a scorched earth policy and burned their land against the advance of the Allies down the Anduin..."―Letter 144
In 2017 a Quora user named Pip Willis published a partial image of a map he claimed his father drew and shared with J.R.R. Tolkien in 1971. Willis alleges that Tolkien wrote on the map "Here may be Entwives", in an area on the west bank of a southern bow of the river Carnen flowing into the Sea of Rhûn.
Hope this helps
We have a video coming out on this topic next week... haha
Good job on the video! I watched it last night.
Men of the West also have a video on that. I just got a recommendation on Youtube https://www.youtube.com/watch?v=wNEvJiXGseo