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English Below 
どちらも忍び駒 Both are called "Shinobi Goma"

忍び駒(左)は三味線を静かに練習する為の駒。
https://amzn.to/4lRYEoi
忍び駒(右)は南部地方(岩手)のお土産で
https://amzn.to/3GwE4uS
人目を忍んでお供えしたことからこの名前がつきました。

The left is the mute bridge for ​Shamisen.
https://amzn.to/4lRYEoi
The right is the souvenir of the Nanbu(the present Iwate),
https://amzn.to/3GwE4uS
This is named after people offer this doll to the shrine in secret.

Shinobi 忍び means in secret.,

Koma 駒 has Brigde and Horse, two meaning.

That's the interesting coincidence!