No, they're brilliant. Really. I know they've got a long dull name, but they describe some of the most playful and loveable words you could come across anywhere.
Frequentatives are words which have grown some extra letters on their ends to show that an action is being repeated.
Usually the extra letters are LE.
Like, for instance, sniffle means to sniff a lot. Then there's waggle (wag a lot, of course) and paddle (you're ahead of me) all gloriously silly words.
And then there are some interesting frequentatives which don't work in quite the same way, like dazzle (daze) and, perhaps my favourite of all, nestle (nest).
Word to use today: waggle.
From wagian, which means to shake, and perhaps also from the Old Norse word vagga, which means cradle.