bat - bat?
chicken - winged something?
cow - cow?
mooshroom - ?
pig - ?
rabbit - rabbit
sheep - koopa (multicolor)
squid - blooper (or cheep cheep)
villager - toad
cave spider - ?
enderman - shy guy
spider - wiggler or bully
pigman - clubba
blaze - lakitu
creeper - bobomb
elder guardian - porcupuffer (or super blooper)
guardian - cheep cheep (or blooper)
endermite - fuzzy
ghast - boo
magma cube - red thwomp
shulker - ?
silverfish - spiny or buzzy beetle
skelly - hammer bros
slime - thwomp
witch - magickoopa