Frogz spawn question

[Alex_hairymoney]

For about 2 months now I seen this bubble out of one of my frog spawn now one of my colony’s have it any one know what this can be

 

[Alex_hairymoney]

?

 

[EeyoreIsMySpiritAnimal]

It's normal. No one's sure why it sometimes happens but they do this sometimes.

 

[jabberwock]

fart