Irish Potato
Noun
じゃがいも
「じゃが芋の皮、剥ける？」「心配しないで。朝飯前だよ。」
"Can you peel the potatoes?" "Don’t worry. It’s piece of cake."
A じゃが potato happens to be a white potato, or maybe an irish potato. There are different kinds of potatoes, and this is one of them.
The reading is the same as what you learned with the kanji.