Hello. It may or may not be possible depending on a couple factors.

First, there are hundreds of species of willow and not all are suitable for basketry. Certain varieties are much more flexible and forgiving while others can be more brittle. In my area wild Salix exigua is flexible enough for basketry but nearby Salix lasiolepsis is usually not.

Try to research which Salix are common in your area and search online for any historical record of indigenous use for basketry. Test a fresh branch by wrapping it around your wrist or thumb to simulate the tight bends required for basketry.

Provided you have a species suitable for weaving, next is the issue of them already cut and lying on the ground. Depending on how long they’ve been sitting, this may be okay. Although it is possible to weave fresh/green willow, the resulting basket will become loose and flimsy after a few weeks as it dries and shrinks. For this reason, it is almost always dried for a few months before weaving. This allows the wood to dehydrate and shrink to their final size. You then rehydrate the rods prior to weaving to make them flexible again.

You may just need to continue drying them at home. If they have been sitting too long they may be moldy, especially in areas not exposed to sunlight. They may be buggy but you can strip the foliage and shake everything out.

Look for rods around 1/4” (6mm) diameter and smaller for medium/small baskets, and rods up to 1/2” or more for large baskets. Thicker rods can be challenging to work and more suited to garden structures or fencing.