How to get, grow and ride a Happy Ghast in Minecraft
Its mechanics are unchanged up to 26.3; the only addition is the Golden Dandelion in 26.1, which can keep a baby small.

The Golden Dandelion is crafted from a Dandelion in eight gold nuggets; used on a baby animal, it stops it from growing up until used again, grants Saturation in stew and gives Yellow Dye. Like every small flower, it gives a dye and flavors suspicious stew. All small flowers work the same; the Oxeye Daisy page explains them.
It is made with the Crafting Table from 8 × Gold Nugget and Dandelion.
8 × Gold Nugget + Dandelion → Golden Dandelion
// Slots with several items cycle through every accepted option.
Its mechanics are unchanged up to 26.3; the only addition is the Golden Dandelion in 26.1, which can keep a baby small.
A Golden Dandelion used on a foal stops it from growing; use another one to let it grow again.
At the Crafting Table: 8 × Gold Nugget and 1 × Dandelion give 1 × Golden Dandelion. Mining the block drops it. Sold by Wandering Trader.
It is a decorative flower that gives a dye and a suspicious stew effect. It is an ingredient in 2 recipes, made at the Crafting Table; for example Suspicious Stew and Yellow Dye. Effects: Saturation (Suspicious Stew).
No: when a piston pushes it, it breaks and drops as an item.
Yes: fire can spread to it and destroy it.
Oh Shiny (Distract Piglins with gold).