Them stumps can be a serious problem with getting stuck especially for the bigger boats. Been a few moons back when I took a fella fishing in my Scanoe, on his first journey, above "the logs". Enjoyed the day til we got caught up in a hard wind that had us bouncing off stumps, like we was in a pin ball machine. No electric motor back then, just paddled our asz off..... to no avail.
Would not recommend jumping out of the boat and try pushing your boat off one them stumps, without first testing the waters. Not only are there deep pockets to be found, but straddling a submerged stump just don't sound like fun.