I suspect that you won't find any published poems in digital form yet. Seamus Heaney considers the effects of the famine in
At a Potato Digging. See
www.universalteacher.org.uk/anthology/seamusheaney.htm#potatodigging But there may well be folk songs with lyrics that refer to the famine.
You should probably start by searching online for Irish political-cultural societies in Boston and New York. What you are looking for is probably in some people's heads, or on bits of paper.
Perhaps you can be the first to get the lyrics into a digital form, to share more widely.