You mean pinkie mice as we call them? Yes, I know they can be fed to chameleons but I think yours is way too young for that at 5 months, even though your cham is a good size. You wouldn't want him to choke! Maybe someone else can chime in here on that subject but I would be scared to death to feed one of those to mine at such a young age! Stick to the crickets for now and try some other bugs. Again, this is just my opinion and maybe someone join in here on the subject.
when i was getting advice for my melleri. i was lead to try a shower chamber to get them to drink. i will say it is definitely a sure shot to getting any of my chams to drink and honestly even many sick chams will still drink when given this.