Is the spawn OK?

After i cleared 10-house town from zombies there apeared hoards of frogs and shit…

Was the spawn reworked or is it ok?

You must be around a swamp, if so please bend over and touch you toes as everything in the swamp will kill you near instantly with speed.

Swamps are very lively places chock full of fun, anthropophagous mutated wildlife who are all dying to eat meet you.

Also spontaneous generation.

This happened to me, but with animals [The Garden of Eden?].

And it happened again with fungaloids, some minutes after I killed the fungal spire.