Greco, 25, produced career highs with 30 goals, 29 assists and 59 points in 75 AHL games with the Springfield Thunderbirds last season, leading the team in scoring. Greco also paced the entire AHL in shots on goal (267) for the second year in a row.
The native of Queens, N.Y., represented the hometown Thunderbirds at the 2019 AHL All-Star Classic in Springfield and set a league record in the CCM Fastest Skater event at the annual Skills Competition with a time of 13.251 seconds.
Greco also skated in one game with Florida last season, making his NHL debut on Dec. 13, 2018, against Minnesota.
In 224 AHL games over three seasons with Springfield, Greco has totaled 75 goals and 63 assists for 138 points.
Toninato, 25, was acquired by the Panthers in a trade with Colorado on June 29. He tallied 14 goals and 15 assists for 29 points in 57 AHL games with the Colorado Eagles in 2018-19, his second pro season.
The native of Duluth, Minn., also appeared in two games with the Avalanche and scored his first NHL goal on Feb. 14, 2019.
Originally selected by Toronto in the fifth round of the 2012 NHL Draft, Toninato has totaled 21 goals and 20 assists in 88 AHL contests with Colorado and San Antonio. He has added one goal and two assists in 39 NHL contests with the Avalanche.