Is there any use to poisonous potatoes in Minecraft?

Solution 1:

So I think what you can do is when you are hungry, you can cram poisonous potatoes into your mouth, and then you can restore more hunger bars than a normal potato.

Interestingly, a poisonous potato actually restores more hunger and gives more saturation than a normal, unpoisoned potato.

(Minecraft wiki)

Additionally:

To counteract the effects of the poison, you can drink some milk when you've done eating the poisonous potatoes- it doesn't have any nutritional value, but will cancel the poisonous effects.

(Neil Slater, via a comment moved to this answer)

Solution 2:

The only use for the poisonous potato is to eat one to gain the A Balanced Diet advancement, and even then you only need a single one.