Why Jeremiah 10:5 was changed from palm trees to scarecrows

So, I was interested in reading Jeremiah 10:1-5 as it referred to Christmas trees. I found the comparison is very striking in the King James Version. As I was looking into this, however, I noticed that some other bible translations compared the tree to a scarecrows in a cucumber field, which I found very odd. When and why was this changed? My other question is in regards to the first sentence of Jer 10:5. I get the first part, "They are upright as the palm tree, but speak not:", but I don't understand the second part "they must needs be born because they cannot go". What does this mean and how does it relate to a palm tree?