f-r-o-g
frog
s-k-i
ski
sl-i-p
slip
friend
s-k-y
sky
sl-o-th
sloth
fr-ui-t
fruit
sk-ir-t
skirt
sl-ee-p
sleep
a-fr-ai-d
afraid
desk
sl-ow
slow
fr-ow-n
frown
sk-i-p
skip
sl-i-d-e
slide