I suppose, with "native" you mean either an interpreter that exists as a ppc native binary or a compiler that can output PPC binaries.
AFAIK these are your choices:

Assembler
C
C++
Draco ( in combination with a C compiler)
E
(Free)Pascal (other Pascal Dialects in combination with a C compiler)
Java (Compiler, but incomplete Runtime Environment)
Perl
PowerD
Python
Hollywood
Lisp
Oberon (not sure about this)
OPS5 ( in combination with a C compiler)
OCAML ( in combination with a C compiler)

a Modula2 compiler seems to being worked at.