What's the font used in "Teenage Mutant Ninja" of TMNT? I know the bottom one is "Turtles" but what is the top one called?

Stone Sans Bold  Suggested by conman1985 

I don't think it is a font; the logo was originally designed in 1987 for the cartoon series. The font called "Turtles" was inspired by the bottom half, but it came along much later.

After study of late 80s and early 90s merchandise, I believe the TEENAGE MUTANT NINJA type may have been based on a condensed ITC Stone Sans Bold (Sumner Stone, 1987) as it was released the same year the original TV show began airing and was also used on several associated products. However, Corinthian Bold Condensed (Colin Brignall, 1981) is also very close, particularly with the look of the M and J, and was even used on some of the Teenage Mutant Hero Turtles logos in the UK/Europe.

UK/Europe TMHT Logo Corinthian Bold Condensed sample:
http://www.hardcoregaming101.net/tmnt/tmnt_files/tmnt-pc-euro-cover.jpg