yeah some fusions don't need em and fus by;
contact fusion to send the mitrials from the feild to the deck (used by gladeator beasts neos and hex sealed fusions)
mech fusion it's the same as contact fusion but the mitirals get removed from play (used by VWXYZ cards)
scnorio sumon it's the same as contact fusion but thair arn't any fusion mitirals so the monsters level together haf to equel the sumoning monster's level (used by secnaro monsters)
and thair's theas cards that let you fusion sumon a monster without polymerazation;
miracal fusion (E*hero)
fusion gate (all)
dubble fusion (all)
future fusion (all)
power bond (machen)
overlode fusion (machen)
time fusion (all)
dd fusion (all)
super polymerazation (all you can fus the oponent's monsters with your own)
metamorphesess (all)
nex (neo-spacains)
miracal contact (neos)
dark fusion (evil hero and feind)
and the famus polymerazation
and thair's sevrel cards that can sumon fusion monsters without fusion sumon;
magical sientect
sumoner of illusion
cyber kien
then thair's cards to sumon fusions with the wrong mitirals;
the 6 hex sealed fusion monsters
godess with the thurd eye
king of the swamp
so thair's menny ways to sumon fusions thair made to be easy to pull out this is just to sumon fusions it dosin't count thair suport cards or other cards to bring out what you need to sumon em so if you want you can make a deck that revolves around fusion monsters!! ^_^
so yeah i think you can sumon fusion monsters without polymerazation!! ^_^