What is the difference between 폭닥폭닥 and 폭신폭신 and 퐁신퐁신 ?Feel free to just provide example sentences.

"푹신푹신" is often used to convey a cuter feeling by replacing "폭신폭신". The original meanings of "푹신한" or "폭신한" refer to something that presses in like cotton or sponge, but gives a sense of coziness.

Examples are as follows:
"푹신푹신한 빵" vs. "폭신폭신한 빵" 🍞
It's fluffy because it's freshly baked.
Saying the same thing, "It's fluffy because it was just baked, making it even more delicious!"

"푹신한 신발" vs. "폭신한 구두 신발" 👟
Shoes that feel fluffy when worn.
Shoes that give a fluffy feeling when worn or shoes that feel "폭신폭신."

"푹신한 소파" vs. "폭신한 소파" 🛋
"푹신한 소파" > The feeling it gives when sitting down.
"폭신한 소파" > Used to express the same feeling in a smaller and cuter way.

"폭닥폭닥" or "퐁신퐁신"
Both feel like mimetic words or onomatopoeia. Personally, I have not used them directly, but their meanings are as follows:

1. '폭닥폭닥' is a dialect meaning cozy or warm.

2. '퐁신퐁신' is used to describe the state of ingredients being evenly and lightly mixed to avoid clumping when making chiffon cake 🎂.