Collective nouns are often used for animals, like a flock of birds or a herd of elephants, but they're less common for describing the act of wobbling.
If you're looking for a creative way to describe a group of things wobbling, you could use a noun that suggests instability or unsteadiness, such as:
* A sway of jelly
* A teeter of toddlers
* A tremor of leaves
* A quiver of flags
Ultimately, the best collective noun will depend on the specific context and what you're trying to convey.