Got an angle grinder with a cut off wheel? As a field mechanic working from a utility body - with no saws except hacksaw - it worked pretty well and quick a couple times when I had to cut some wood including 1x6 oak.
If they are up to about 2 inches branch cutters work best. if your objective is to use it a fine saw works best.
Since this is GJ you need a bamboo saw from Japan.
If your looking to split it I have the proper splitters which I would sell.