I tend to accidentally combine the first part of a word with the second part of the next word - i.e., saying “Atlantic” when I think “Atlanta Olympic.” Is there a name for this tendency?
This sounds like anticipatory error, a type of phonemic paraphasia.
This sounds like anticiparror, a type of phonemiphasia.
Thasia
FWIW this would be called a 'language disorder," not a speech impediment.