The deer hair head on an unweighted muddler helps it float.
Then they "riffle hitch it."
The "Bomber" which is originally an Atlantic salmon fly is popular for skating.
Never tied muddlers before (im obviously not a serious tier) but ones ive store bought have been both weighted and unweighted. The unweighted ones ive both swung and dead drifted upstream as i would any dry; the only truly large trout i hooked out of the west walker took a dead drifted muddled on the surface. It was such a surprise blowing out of the water i set way too fast and broke off.