Since you did not specify the exact lenses you have, there is no way anyone can say "yes or no".
Here is a link to some Tamron lenses that will definitely work on the Digital Rebel:
Scroll down to the Canon section.
Look to the right column.
Scroll down to Tamron.
Click on any of the lenses for a review.
Remember....the Digital Rebel will see the focal length differently than the 35mm camera:
A lens rated at 90mm focal length will appear to be 144mm focal length when on the Digital Rebel.
(multiply the focal length by 1.6).
I have additional Tamron for Canon AF lenses from my Canon Rebel X 35mm camera, will they also fit the Canon EOS Digital Rebel XT?