couch
crawl
creep
go on tiptoe
grovel
gumshoe
inch
inch along
lay wait
lie in wait
lurk
noctambulate
pad
prowl
pussyfoot
scrabble
scramble
shadow
sidle
skulk
sleepwalk
slink
snake
sneak
somnambulate
stalk
steal
steal along
tippytoe
tiptoe
worm
worm along