has he also acted in any other film?
Yes - Frankenstein (1931), Bride of Frankenstein (1935) and Son of Frankenstein (1939).
Introduction
He portrayed Frankenstein's monster in "Frankenstein" (1931), "Bride of Frankenstein" (1935) and "Son of Frankenstein" (1939). He also appeared as Imhotep in "The Mummy" (1932).
who played the mummy in the old movies Boris Karloff
"Frankenstein", "Bride of Frankenstein" and "Son of Frankenstein". “Frankenstein”, "Bride of Frankenstein” and "Son of Frankenstein” to name a few. Yes, "Frankenstein", "Bride of Frankenstein" and "Son of Frankenstein"
Boris Karloff Boris Karloff Boris Karloff
Introduction Introduction Introduction
William Henry Pratt (23 November 1887 – 2 February 1969), better known by his stage name Boris Karloff (), was an English actor who was primarily known for his roles in horror films. He portrayed Frankenstein's monster in "Frankenstein" (1931), "Bride of Frankenstein" (1935) and "Son of Frankenstein" (1939). He also appeared as Imhotep in "The Mummy" (1932).
 He portrayed Frankenstein's monster in "Frankenstein" (1931), "Bride of Frankenstein" (1935) and "Son of Frankenstein" (1939). He also appeared as Imhotep in "The Mummy" (1932). He portrayed Frankenstein's monster in "Frankenstein" (1931), "Bride of Frankenstein" (1935) and "Son of Frankenstein" (1939). He also appeared as Imhotep in "The Mummy" (1932).

In non-horror roles, he is best known to modern audiences for narrating and as the voice of the Grinch in the animated television special of Dr. Seuss' "How the Grinch Stole Christmas!" (1966). For his contribution to film and television, Karloff was awarded two stars on the Hollywood Walk of Fame.
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Boris Karloff [SEP] Introduction
William Henry Pratt (23 November 1887 – 2 February 1969), better known by his stage name Boris Karloff (), was an English actor who was primarily known for his roles in horror films. He portrayed Frankenstein's monster in "Frankenstein" (1931), "Bride of Frankenstein" (1935) and "Son of Frankenstein" (1939). He also appeared as Imhotep in "The Mummy" (1932). In non-horror roles, he is best known to modern audiences for narrating and as the voice of the Grinch in the animated television special of Dr. Seuss' "How the Grinch Stole Christmas!" (1966). For his contribution to film and television, Karloff was awarded two stars on the Hollywood Walk of Fame.