To convert a photo into a funny cartoon, you can use the following apps and online tools:

1. ToonMe: This app offers various cartoon styles and effects to turn your photo into a cartoon. Available on iOS and Android.
2. Prisma: Prisma has a wide range of artistic filters, including cartoon effects. It’s available on both iOS and Android.
3. AI Cartoonizer: A photo to cartoon AI tool that provides cartoon effects and funny styles for photos. Available on Android.
4. BeFunky: An online photo editor that offers cartoonizer effects to transform photos into cartoons.
5. LunaPic: This online tool has various cartoon filters that can add a humorous touch to your photos.

Simply upload your photo to one of these tools, select a cartoon effect, and save the result!