The Log Gar is a fearsome critter from North American mythology.
Description[]
The log gar was a big fish armed with large saw-like teeth inside its snout. It could saw through a log to get to the lumberjack up above, which it often hunted. Once the lumberjack was in the water, the log gar would make mince meat out of him.
Further reading[]
"Log Gar" from Paul Bunyan Natural History (1935) by Charles E. Brown