ethan's dictionary....

ice cream = i-tream
unbuckle (seatbelt) = kak! kak! kak!
mummy = meh meh
monkey = argh argh argh! (think high pitched shriek)
milk = mek mek!
water = gakker
yes = yeah
no = nor....
butterfly and/or barney = bar bar
fish = hish
star = tar
moon = moo...
flower = fower
uncle = ah ker
aunty = ar tee
thank you = ten chio
please = plea
hello = arro
rabbit = babbit
school - shoo

and here's how he pronounces his favourite tank engines from thomas and friends:

thomas = wei
james = jay
percy = pur pur

more words will be added to the list as ethan picks up more words... :)