lalophobia
glossophobia
speech fright
logophobia
verbophobia
telephonophobia
onomatophobia
telephobic
mic fright
I'm scared
sesquipedalophobia
I am afraid of this
phonophobia
hippopotomonstrosesquipedaliophobia
telephobia
sophophobia
enochlophobia
bite one's lip
windjamming
bite one's tongue
blithering
logorrhea
nonspeak
bragging
line-shooting
brag
vaporing
crowing
draw out
crow
gasconade
loudmouthedness
dyslalia
whillywha
unspeakable
tongue-tie
blathering
overtalk
logophobic
filter
babble
overfearfulness
blind tiger
logomania
swallow one's words
cackle
schoolphobia
catagelophobia
doxophobia
yap