It's 'tittle-tattle'. It's generally a noun - "I have no interest in tittle-tattle". I've never heard it used as a verb. 'Gossip' (as a verb and a noun) is much more common.

My thoughts are... In the UK, tittle-tattle is an old-fashioned word. I have not heard this word, or read it in modern literature, for several years. Tittle-tattle and gossip are the same. In principle, I think you could use gerunds for both.

For what it's worth... That gossiping is actually used. I've never ever seen anybody say the other one in any context.

We use 'tittle-tattle' in the UK, though it may be old-fashioned now. It is very much like gossip, but would probably mean something small. A rumour about a major issue such as corruption, jobs at risk, fraud, etc. would not be tittle-tattle. Though these kind of issues would be considered a 'rumour', some people might still say 'gossip', but definitely not tittle-tattle.

There very big differences in each word , let’s begin TICKLE: is lightly touch or prod (a person or a part of the body) in a way that causes mild discomfort or itching and often laughter. "I tickled him under the ears" TACKLING: is making a determined efforts to deal with (a problem or difficult task). And Gossip is idle talk or rumour, especially about the personal or private affairs of others; the act is also known as dishing or tattling.