wallow

in

Hatchet, by Gary Paulsen

to relax -- especially of an animal rolling about in mud or shallow water

or more rarely:  a noun describing the mud puddle or indentation in which an animal relaxes or rolls around

to excessively give into a desire (indulge)

(This is often said of something negative such as self-pity when no attempt is made to move beyond it. But it is also sometimes said without negative connotation just to indicate that someone is enjoying a lot of something such as luxury or rest.)

to move with difficulty; or perhaps just to move through water or in a rolling/wave-like manner