Hi and welcome. I really like the name you chose. For one I used to teach English in Japan, so it brings back memories. Secondly, I'm in Oklahoma and we've had over 30 days over 100 degrees and the thought of snow (Yuki in Japanese) is heavenly.
As far as talking, Timnehs often begin speaking earlier than Congo Greys. Six months is not an uncommon age for them to say their first words, so he may indeed be on the verge.