Taiko
Noun and の adjective
たいこ
お腹がパンパンで太鼓みたいになっています。
I beat my stomach "pom-pom" like a drum.
A really fat thing you hit to make a beat is called a drum. A taiko drum, that is. They're really big and fat looking and are super cool to watch and play!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.