I occasionally see 何言っとんだ？ where I would expect 何言ってんだ？ but I am not sure that
とん comes from ておくの. I thought [ん 縮約形 only occurred with
ら行](https://japanese.stackexchange.com/a/61959/30454).

> 今さら、何言っとんだ？ ([source](https://0ut0fyah00.blog.fc2.com/blog-entry-3940.html))

> 何言っとんだ。ようやってると思ってたのにこれでマイナスポイントだよ。
> ([source](https://mobile.twitter.com/tsboccoli/status/1296423042130874368))

> 何言っとんだ？
> ([source](https://twitter.com/poke_times/status/1302803784591011840))
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2021-12-12T21:53:56.500
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2021-12-12T23:43:58.617
30454
question
grammar contractions morphology
What contraction is this?「何言っとんだ」