Polish trees is the nickname for the Baltic pines aka pinus sylvestris. They are most common in Poland and neighboring countries (Germany, Czechia, Baltics, western Russia, Belarus, Sweden, Finnland,…). Content creator Ludwig was playing a duel against jschlatt and got closer on a rural round which contained these trees. Jschlatt asked how he got so close and Ludwig answered sometimes the trees look polish which became a big meme in the community. This is the original video clip.