Can I put the question word "where" at the end of a question? [closed]

Placing the wh-word in a question containing one at the end is uncommon except in what are known as echo questions:

Leslie: "I put the deer carcass in the laundry room."

Kelly: "You put it where?!?"

.......

Sabrina: "I went to the party last night.

Salem: You did WHAT!?"

.......

_"This creature can be found up the rear end of sea cucumbers."

_"This creature can be found where?"

Otherwise, this type of end-focus isn't common (though it is not ungrammatical). It would be used only to focus attention on the wh-word itself, say in a quiz or test:

Napoleon's second place of exile was ... where?

(Or perhaps when doing a Noël Coward impression.)

This creature can be found where?"

Yes, that is an interrogative clause, due to the presence of the interrogative word "where".

In your example, the interrogative word/phrase has not been fronted, but rather it has been left in place (that is, in situ). When the interrogative word/phrase is fronted, then obligatory subject-aux inversion occurs--if that clause is a main clause.

"This creature can be found where?"
"Where can this creature be found?"

Both clauses are of the type that is grammatically known as interrogative clause.

It's grammatical because for instance one might start out saying "this creature can be found" and then realize he doesn't actually know or isn't sure he understood. Listeners understand. So, some such mental process, one that naturally starts out declarative and unexpectedly switches to the interrogative at the end, is implied.

A tutor might use it, to check if the student's paying attention, or a text might use it as it's used here, to focus attention on the demand.

In both cases, either a period or a semicolon is required. The second sentence is less awkward, in my opinion. As F.E. stated, both are examples of the interrogative.