From Know Your Enemy Update #2

Jroggers

Jroggers are pretty strange in design, but simple when it comes to their AI. A mix between a spring, hotel bell, a television, and a frog, Jroggers are known for jumping glorious heights in the game. These enemies are immune to your energy shield so a good bounce on the head will end it off quickly.

One of the best parts about a Jrogger is it’s jumping ability as mentioned previously. If you time your bounce perfectly, Jroggers can help you up to hard to reach areas. Jroggers can help you reach new heights that were once unreachable with your standard double jump. With the right bounce, you can find all kinds of secret areas and hidden goodies!