It's not, as long as you ensure you are using only black/white. I wouldn't use colored ink. It's what I use for all my herps/amphibs. The VA living museum also uses it often. Inexpensive, easy to clean!Bottomfeeder;4809651; said:Keeping Frogs on newspaper is a bad idea. I'd imagine the newsprint would be toxic...
Laticauda;4808572; said:They are bottomless pits, and eat you out of house and home. I would recommend cocofiber substrate, it's relatively cheap and doesn't harm the environment.
I've known people to keep them on newspaper, but they do enjoy burrowing down into the damp dirt, so I believe it's a matter of personal preference. The newspaper would be easier maintenance wise.