Terengganu people have this inclination to use 'nnisang kerek' when making porridge - namely Bubur Jagung, Bubur Gandum or even as one of the ingredients when making their Gula Ikang Aye (Gulai Ikan Tongkol) to be eaten with yummy Nasi Dagang. Kinda weird when I refer the Terengganu people as 'they' when I myself have blended (hey, I'm married to a man from there) with them.
I remember asking my FIL to bring along some 'kerek' of that 'nnisang' and, like always, he brought more than I asked for. If I requested for just 3, he'd bring along like 7 or 8. This 'manisan' come in round flat disc, around 1/2 inch thick. For those who happen to have have the experience mandi di telaga, you might know that round cement mould stack onto one another to make a telaga. Those are called 'kerek' in my kampung. So I guess that Nnisang Kerek's kerek, refers to that shape (kot - just my assumption) I still have a few discs in my fridge. The other day, I did agar-agar with that.