Quaggy a. : Of the nature of a quagmire; yielding or trembling under the foot, as soft, wet earth; spongy; boggy.

Example:
Does any know the Roald Dahl poem, In the quelchy Quaggy sogmire, from "Charlie and the Great Glass Elevator?

Taxonomy
Brook, rises, River Quaggy, the River, tributaries, Kyd, regeneration, river flows, Chinbrook Meadows, free encyclopedia, Mottingham, elevation, Middle Kid, Chin, Chislehurst, Quaggy River, upper reaches, Lewisham.

Defination from the web:
Quaggy within Chinbrook Meadows and other parks was channelized into long straight concrete culverts to alleviate flooding. ... Middle Kid Brooke (1.9 km), rises in Kidbrooke and flows southest splitting into two distributaries before joining the Quaggy in Lee. ...