blockhead
dunce
numskull
logger-headed turtle
shrike
dolt
dullard
marine turtle
pillock
poor fish
pudden-head
pudding head
sea turtle
stupe
stupid
stupid person
at loggerheads
about
aldermanic
big-headed
bliaut
chaine
counterfoil
disconsolate
extra-human
fencepost
gooseneck
helmeted
landlocked
leatherback
scrimshaw
sea
shipmaster
soft-shell
teetotum
upend