Lfun:	set_frog - turn the monster into a frog

Synopsis:
	void set_frog()

Description:
	The set_frog calls the frog curse upon the monster.

Return value:
	none

Examples:
	set_frog();

Note:
	As set_frog has no argument, the curse could NOT be removed via
	"set_frog(0)"! It always turns the monster into a frog! To remove
	the frog curse use "frog_curse(0)".

See also: living/frog_curse