I've been studying Japanese for a while, but it's always nice to learn something from candy. Looking at these, I had no idea what a 白樺 (shirakanba) was, and now I know it's a Japanese white birch. So, these could be called Morinaga White Birch Twigs.
In any case, these are a special version of Koeda chocolate for winter. The box claimed they were made cashew nuts and another mystery word: ラングドシャ (rangudosha). After some digging, I found out that it was French - Langues de Chat, which means cat tongues. Basically, they are crunchy, buttery cookies that are sort of shaped like a cat's tongue.
I don't think I've ever had to do so much research to understand a snack! It's too bad, too, because these just weren't that good. All that hype for some buttery white chocolate. The box had 12 packs with 4 sticks each, and I have only had 1 pack since I bought them a couple weeks ago.
The sticks were very rich, and the main flavors I picked out were butter and vanilla. I couldn't detect any cashew bits in these, and a little saltiness would have been nice. They were okay, but very rich; not something I'd want to eat a lot of. They were such a let down, because I really loved the matcha Koeda. At least I learned something.
Morinaga Website (Japanese)