we do the same.we walk the ponds,except I walk in the water and shine to the bank. the frogs set looking toward the water and you can see there whith belly shinning.
in the river we use the boat and one guy runs the boat the other does the sticking.
we use an ice chest with a hole cut in the lid.( you take a large can and cut a hole in the lid that just fits the can.cut the bottom of the can like a slice of pie.)
don't cut the slices off,just push the points down a little,then when you push a frog into the hole the points will open a little but the frog can't get back out.works real well.

good luck,let us know what time supper wiil be when you get them skinned.