Bucket of Pufferfish
minecraft:pufferfish_bucket
A food item that restores 1 hunger and 0.2 saturation. Obtained from Wandering Trader villagers. Doesn't stack.
How to get it
No direct recipe — it's made using a Bucket:
Crafting 
→ 
Bucket
💰 Sold by villagers
Wandering Trader · Novice 
3 → 1 Bucket of Pufferfish
3 1 Bucket of Pufferfish