Obviously I can't tell what the lumps are, but I'll take a guess.  Many
labs place a small bead of metal near the margin of the crown, usually
on the surface facing the tongue.  This should be removed before
cementing the bridge, but if your dentist neglected to do it before it
can be done now (obviously a bit of care is required).  The surface can
then be polished.
    If the crown(s) are just bulky, you may get used to it in time.
Sometimes the crowns can be carefully re-contoured in the mouth if the
thickness of material allows it;  if it is ceramic it will not be
possible to re-glaze, but usually it can be polished well-enough to be
comfortable.  If it is grossly overly bulky it's better to try to tap
the bridge off and send it back to the lab.  If the teeth were
adequately prepared it should be possible to make a bridge where the
teeth aren't bulkier than the teeth that were there before.
    One last thing--if you were walking around with missing teeth for a
long time and now the teeth are replaced, it is common in my patients to
report that their tongue feels "crowded" by the new teeth.  But you at
one point got used to the space, and in time you'll get used to the new
teeth.

Steve