Are my potato plants healthy

Look good to me!

Look good. Whats going on with those in bottom right corner, are they dead, or need more water ?

I'd mound them up with compost, or dirt to keep them upright.
You do know that, potatoes grow potatoes, above seed ?
Unlike !!!
Sweet potatoes, that grow potatoes, below, seed.
They are young plants ! I'm i right ?
Get em buried deeper.
😎😎😎

How long ago did you plant them?
What are they planted in?

Most look OK, one or two look real good.
What type are they?

Your potato plants look fine. One way to increase your crop is to mound them near to the top with straw or hay. Beware of compost; too much nitrogen will make large plants but few potatoes.

BTW, in post-Columbus Europe during wars, farmers who grew potatoes fared better than farmers who grew wheat. Wheat could be burned to kill the crops, potatoes couldn't...