A participle that ends in ing for jocund?

If you are referring to Gerunds (what I gather Americans call Present Participle), then yes, they do. There is also another mood, the Participle (Or Past Participle), which does not end in -ING.

This is the definition of a gerund.

A participle that ends in ''ing'' and functions as a noun is a gerund.

The term you seek may be "gerund." Note, however that many grammarians say that although a "gerund" looks like a present participle, it is not.

A participle that ends in ing and function as a noun is a gerund.Example. "He had a ringing in his ears." The term you seek may be "gerund." Note, however that many grammarians say that although a...