扭蛋 Origin — Dong Chinese Dictionary

niǔdàn

capsule toy

niǔ, niu turn

Phonosemantic compound. 扌 represents the meaning and 丑 represents the sound.

扌 Meaning component

shou, shǒu hand

扌 is a component form of 手.

丑 Sound component

chǒu second earthly branch; (simp.) ugly

	Old Chinese
Zhengzhang	nuʔ
	tnuʔ

Phonosemantic compound. 虫 represents the meaning and 延 represents the sound.

yán delay

Change in sound

蛋 and 延 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
蛋 l'aːns
延 *la[n]

虫 Meaning component

chóng bug, insect

	Old Chinese
Zhengzhang	l'aːns