Can I give this for my gerbs?

Not sure what it is, could be something similar to pine cones? I did see one squirrel having it in his mouth, though. It is all over our town and inside of it looks quite empty. Has anyone tried giving it to gerbils for chewing?

Not sure what it is, could be something similar to pine cones? I did see one squirrel having it in his mouth, though. It is all over our town and inside of it looks quite empty. Has anyone tried giving it to gerbils for chewing?