These are the dango (mochi with fillings) that my uncle always sends out to the family. This particular one that my uncle sends out to us is famous and come from Eiheiji, a famous temple in Fukui, Japan.
The three colors are white, green, and yellow. White ones have a walnut paste filling, green ones are yomogi flavored with red bean paste inside, and yellow ones have sesame paste inside. They are very filling snack.
Eiheiji, ryuzen dango website: http://www.riuzen.jp/d.html