Breakdown of Wat enorme kikkers! Wonen ze hier?
hier
here
wonen
to live
wat
what
ze
they; she (unstressed form of zij) / them (object)
Questions & Answers about Wat enorme kikkers! Wonen ze hier?
Why do we say Wat enorme kikkers and not Wat een enorme kikkers?
Because kikkers (frogs) is plural. In Dutch, you use wat een for singular countable nouns (like Wat een grote kikker!). For plural nouns, uncountable nouns, and standalone adjectives, you drop the een and just use wat.
Why does the adjective enorm get an -e added to it (enorme)?
Because kikkers is a plural noun. Whenever an adjective comes directly before a plural noun, it gets an -e ending. The exclamation word wat doesn't interfere with this normal adjective spelling rule.
Is it okay to use zij instead of ze in the second sentence?
Grammatically yes, but ze sounds much more natural here. Ze is the unstressed form of zij (they). You would only use zij if you really wanted to emphasize they (for example, if you were contrasting the frogs with some other animal).