Take off the socks, put the shoes back on, cross. Empty water out of shoes, put on socks, put on shoes.
I do take crocs some trips when the streams flow gently enough that I can see where I'm stepping, but when the footing isn't certain and you can't see through the water, boots or shoes are better.
The formula for blisters is heat, friction and moisture. I've walked through multiple stream crossings in shoes and socks with nary a blister to show for it - my shoes fit great. The lightweight wool socks and non goretex mesh trail runners let the water run right out in minutes.
One of numerous reasons I remain disinterested in goretex.
"In the beginner's mind there are many possibilities. In the expert's mind there are few." Shunryu Suzukihttp://hikeandbackpack.com