Here's another of those "What was the name of that game?" threads. This time, we're talking a DOS game, likely released between 1992 and 1994. It was definitely after Wolfenstein 3D and around the era of Ken's Labyrinth and DOOM. I believe it was originally distributed on floppy disks.

What I can remember of it is that it started underground. There were lots of wood textures which were used throughout as many of the walls were wooden and there were lots of wooden crates. What made it special at the time was though it was still sprite-based, you could look up and down, jump, and climb ladders, all things that DOOM lacked. About level three you finally made it to the outside but once out there it was even more dangerous than inside because there were lots of enemies about and they had long-range vision. The outside area was at night, and the graphics were somewhat cartoony in this game. And believe it or not, it seems that the game had something to do with frogs. Like the developer or publisher had "Frog" as part of the name, or the outdoors level had frogs as enemies.

Any ideas?