Not sure about jets but ducted fans have higher thrust when on the ground. The difference is that they generally have less thrust on the ground than a prop, but more thrust than a prop at speed, but they still have more thrust on the ground than when in the air. F=MA is still at work, the air is accelerated to a higher delta V when on the ground which is more mass to create the higher thrust on the ground. F=MA is easier to calulate with fans and jets because almost all of the air goes straight back. With a prop some of it goes to the side near the tips, and some wraps around in a vortice at the tip, some is lost against the cowl, and some is lost with frictional losses against the fuse.