So I had to craft tons and tons of ammo to kill a lot of them and I only got 1 egg from like 10 stompers or smth. I thought it was weird and went to the google which lead me to the FFF-424:
Which I did and got like 10 eggs in no time, with minimal ammo spending.Destroying an egg raft will yield some of the pentapod eggs it contained. Pentapod eggs are a key ingredient needed to make the Biochamber - an important bio processing machine on Gleba. Make sure to use the eggs quickly though. Like many biological items on Gleba they're on a timer, however, they don't "spoil" in the normal way. Wait too long and you may find yourself face to face with a hungry hatchling pentapod...
I know that the "egg raft" is just next to the pentapod recipes, but I swear I looked at it a dozen of times and missed it.
So I think it is worth it do add the pentapod egg farming section to "tips and tricks", next to the lava and lighting mechanics.