Nasality in Japanese

Recently, vocab have have popped up that seem to have a slight nasal tone (かき氷, ありがとう)…? Is it just an accent thing specific to the voice actors? If not, are there many other words that are pronounced like this?

Have you searched the forum?

https://community.wanikani.com/search?q=nasal
https://community.wanikani.com/t/i-keep-hearing-g-as-n-in-vocab-readings/16232/3

To be fair, I did try. Guess my searching skills need polishing. Thanks!