Who's afraid of the big black bat?

I've been going through some paper. Well, no, a lot of paper. I found a load of riddles I wrote back in 2005 One of them goes:
Dormant giant standing tall When he wakes you'll hear his call Before long he'll start to spew His burning hot insides on you
That one was easy. I have like 3 pages of them. Here are some somewhat better ones
I have a mouth but nothing more A rock hard tongue rests in my jaw I'm hung from head, and start to sing I'm heard by all and everything A sightless creature I live in the black People fear me cos they think I'll attack But fear not my friend for we don't really bite Now please be a dear and turn off the light In August Houses Manor Halls Fifty portratis stand proud and tall Though royalty is what we be We are not ashamed to play with thee Me and thirty of my kind Will help to break and smash and grind We stand out bright, we shine out white We stalgmite and we stalactite
and lastly
I'm unknown to you, you've to understand me Before you can guess what I happen to be You know what I am but your mind is doubt So think one last time and figure me out
Strangely fitting, I did a picture of the Riddler yesterday. Here it is.