why does keith call monty mouse? does anyone know?

yep! sure do!
its because he was shy as a kid and the nickname kinda stuck.
hehe funny story: the first boat he worked on, the captain wanted to know what his nickname was but he didnt want to tell him it was 'mouse' so after a few days guessing, this guy said "i bet it's a rodent" so monty was called "weasel" untill he admitted it was actually "mouse".

ha thank you so much
i was thinking something along those lines but i wasnt sure i also thought maybe it was just a meanie big brother thing lol
wow from the way that the show shows him i never wouls have pictured him shy
thanks man