Looks like Mock Strawberry (Duchesnea indica). Not poisonous but not really edible either.

Please be aware that there are gradations between "poisonous" and "okay to eat". As a general rule, one should teach small children to never taste, or even handle wild plants unless they've been picked and put in a salad by someone who clearly knows the identity of the plant.

Even some of the most familiar plants used in our gardens and landscapes have toxic parts. You might be surprised (and horrified).

Just sayin'. ;-)