Batrachian

Meaning: of frogs and toads.

Usefulness: 1 (depends on culture and context: if you're English, and therefore statutorily obliged to insult the French at least once a week, it would be quite handy. If you're not, its usefulness may depend on your proximity to lakes, swamps or French restaurants.)

Logofascination: 2

Paronomasia

Meaning: a pun, wordplay based on words that sound alike

Usefulness: 2 (it'd be more useful if I could think of a pun)

Logofascination: 1 (it's from an old Greek term, and there is something that appeals in the idea that puns are part of the human condition)

Riparian

Meaning: to do with river banks

Usefulness: 2-3 (depends where you live)

Logofascination: 3