Curious about synonyms for 'standing water,' I checked 'plash' on MW Unabridged. Well, nothing much there. But there was a synonym for the verb 'plash' that I hadn't heard before:

spurtle

Silly-sounding word, spurtle. Here's the MW definition:

"Function: verb
Inflected Form(s): spurtled; spurtled; spurtling \]d.li, ]t()li\; spurtles
Etymology: freq. of 3spurt
transitive verb : to cover with spatterings : SPRINKLE
intransitive verb : to break forth suddenly in a stream or spatter <the white spurtling surf -- Russell Thacher> "

But then there's a noun, spurtle, that was definied as a spatula-like cooking implement (chiefly Scottish) used for turning griddle cakes. Wonder whether it was named the spurtle because of the spurtling sound of those griddle cakes cooking?