One sentence

No.

Tell me what things Tom and Jack think are smelly / think smell.

I don't know what you mean by 'in order'.

Is the sentence meant to finish with the word "order"? If so, it makes no sense. If not, my best suggestion would be something like:

Tell me the things that Tom and Jack think are smelly, in order that I may remove those things from the house.

Note - I have totally invented the second half of the sentence, I just wanted to put something after "in order".

Thanks Mister Micawber,

That sentence is a direction by a teacher to his students, esp. children who has not learned about relative pronoun.

And the situation is this: After reading a book the teacher asks about the the contents of the book. In the book, two children smelled a bad smell and they guessed where it came from, like from some cows, garbages, etc.

That's wh

Do you mean "take turns telling me..." for "in order."

A gives and answer, then B, and then C, and then A again, then B, then C, etc. etc

...or perhaps he wants them to list, in the order in which they appeared in the story, the things which smelt bad.

1) Cows
2) Smelly feet
3) Garbage

etc etc

Because the sentence will be said to young students, couldn't it be possible using "the things that are smelly"?
Yes you can, but as a general teaching practice, don't take your/their English down to the child-talk or baby-talk level. Much of that vocabulary is grown out of. Use standard adult English whenever possible.

"Tell me the things that Tom and Jack think those are smelly in order."?

Hmm. I thought it meant, "First tell me the things that Tom thinks are smelly, and then tell me the things that Jack thinks are smelly."