Yes they did. Alex Jones initially called Sandy Hook a hoax and the families crisis actors. He is being (so far successfully) sued for such acts[0]. He did walk back some of those claims, but here's his words:

>"Yeah, so, Sandy Hook is a synthetic completely fake with actors, in my view, manufactured. I couldn’t believe it at first. I knew they had actors there, clearly, but I thought they killed some real kids. And it just shows how bold they are, that they clearly used actors. I mean they even ended up using photos of kids killed in mass shootings here in a fake mass shooting in Turkey -- so yeah, or Pakistan. The sky is now the limit. I appreciate your call."[1]

They're tricky to find because they are not written but made live on a radio show, but yeah Infowars absolutely claimed that sandy hook parents and children were actors.

[0]: https://www.nytimes.com/2018/07/31/us/politics/alex-jones-de...

[1]: https://web.archive.org/web/20170303201414/http://www.politi...